diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index d664249..eba022d 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -6,10 +6,12 @@
   <component name="ChangeListManager">
     <list default="true" id="b30e2810-c4c1-4aad-b134-794e52cc1c7d" name="Changes" comment="style: lint">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/ToolInputAndResult.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/ToolInputAndResult.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/options/ToolOptions.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/options/ToolOptions.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/number/generate/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/number/generate/index.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/number/generate/service.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/number/generate/service.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/package.json" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/list/sort/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/list/sort/index.tsx" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/list/sort/meta.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/list/sort/meta.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/list/sort/service.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/list/sort/service.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/list/sort/sort.service.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/list/sort/sort.service.test.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/utils/string.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/utils/string.ts" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -25,7 +27,7 @@
   <component name="Git.Settings">
     <option name="RECENT_BRANCH_BY_REPOSITORY">
       <map>
-        <entry key="$PROJECT_DIR$" value="chesterking" />
+        <entry key="$PROJECT_DIR$" value="main" />
       </map>
     </option>
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
@@ -46,43 +48,43 @@
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent">{
-  &quot;keyToString&quot;: {
-    &quot;ASKED_ADD_EXTERNAL_FILES&quot;: &quot;true&quot;,
-    &quot;ASKED_SHARE_PROJECT_CONFIGURATION_FILES&quot;: &quot;true&quot;,
-    &quot;Playwright.JoinText Component.executor&quot;: &quot;Run&quot;,
-    &quot;Playwright.JoinText Component.should merge text pieces with specified join character.executor&quot;: &quot;Run&quot;,
-    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
-    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
-    &quot;Vitest.compute function (1).executor&quot;: &quot;Run&quot;,
-    &quot;Vitest.compute function.executor&quot;: &quot;Run&quot;,
-    &quot;Vitest.mergeText.executor&quot;: &quot;Run&quot;,
-    &quot;Vitest.mergeText.should merge lines and preserve blank lines when deleteBlankLines is false.executor&quot;: &quot;Run&quot;,
-    &quot;Vitest.mergeText.should merge lines, preserve blank lines and trailing spaces when both deleteBlankLines and deleteTrailingSpaces are false.executor&quot;: &quot;Run&quot;,
-    &quot;git-widget-placeholder&quot;: &quot;main&quot;,
-    &quot;ignore.virus.scanning.warn.message&quot;: &quot;true&quot;,
-    &quot;kotlin-language-version-configured&quot;: &quot;true&quot;,
-    &quot;last_opened_file_path&quot;: &quot;C:/Users/HP/IdeaProjects/omni-tools/src/assets&quot;,
-    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
-    &quot;node.js.detected.package.tslint&quot;: &quot;true&quot;,
-    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;,
-    &quot;node.js.selected.package.tslint&quot;: &quot;(autodetect)&quot;,
-    &quot;nodejs_package_manager_path&quot;: &quot;npm&quot;,
-    &quot;npm.dev.executor&quot;: &quot;Run&quot;,
-    &quot;npm.lint.executor&quot;: &quot;Run&quot;,
-    &quot;npm.prebuild.executor&quot;: &quot;Run&quot;,
-    &quot;npm.script:create:tool.executor&quot;: &quot;Run&quot;,
-    &quot;npm.test.executor&quot;: &quot;Run&quot;,
-    &quot;npm.test:e2e.executor&quot;: &quot;Run&quot;,
-    &quot;prettierjs.PrettierConfiguration.Package&quot;: &quot;C:\\Users\\HP\\IdeaProjects\\omni-tools\\node_modules\\prettier&quot;,
-    &quot;project.structure.last.edited&quot;: &quot;Problems&quot;,
-    &quot;project.structure.proportion&quot;: &quot;0.0&quot;,
-    &quot;project.structure.side.proportion&quot;: &quot;0.2&quot;,
-    &quot;settings.editor.selected.configurable&quot;: &quot;settings.typescriptcompiler&quot;,
-    &quot;ts.external.directory.path&quot;: &quot;C:\\Users\\HP\\IdeaProjects\\omni-tools\\node_modules\\typescript\\lib&quot;,
-    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "ASKED_ADD_EXTERNAL_FILES": "true",
+    "ASKED_SHARE_PROJECT_CONFIGURATION_FILES": "true",
+    "Playwright.JoinText Component.executor": "Run",
+    "Playwright.JoinText Component.should merge text pieces with specified join character.executor": "Run",
+    "RunOnceActivity.OpenProjectViewOnStart": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "Vitest.compute function (1).executor": "Run",
+    "Vitest.compute function.executor": "Run",
+    "Vitest.mergeText.executor": "Run",
+    "Vitest.mergeText.should merge lines and preserve blank lines when deleteBlankLines is false.executor": "Run",
+    "Vitest.mergeText.should merge lines, preserve blank lines and trailing spaces when both deleteBlankLines and deleteTrailingSpaces are false.executor": "Run",
+    "git-widget-placeholder": "chesterkxng",
+    "ignore.virus.scanning.warn.message": "true",
+    "kotlin-language-version-configured": "true",
+    "last_opened_file_path": "C:/Users/HP/IdeaProjects/omni-tools/src/assets",
+    "node.js.detected.package.eslint": "true",
+    "node.js.detected.package.tslint": "true",
+    "node.js.selected.package.eslint": "(autodetect)",
+    "node.js.selected.package.tslint": "(autodetect)",
+    "nodejs_package_manager_path": "npm",
+    "npm.dev.executor": "Run",
+    "npm.lint.executor": "Run",
+    "npm.prebuild.executor": "Run",
+    "npm.script:create:tool.executor": "Run",
+    "npm.test.executor": "Run",
+    "npm.test:e2e.executor": "Run",
+    "prettierjs.PrettierConfiguration.Package": "C:\\Users\\HP\\IdeaProjects\\omni-tools\\node_modules\\prettier",
+    "project.structure.last.edited": "Problems",
+    "project.structure.proportion": "0.0",
+    "project.structure.side.proportion": "0.2",
+    "settings.editor.selected.configurable": "settings.typescriptcompiler",
+    "ts.external.directory.path": "C:\\Users\\HP\\IdeaProjects\\omni-tools\\node_modules\\typescript\\lib",
+    "vue.rearranger.settings.migration": "true"
   }
-}</component>
+}]]></component>
   <component name="ReactDesignerToolWindowState">
     <option name="myId2Visible">
       <map>
@@ -107,19 +109,7 @@
       <recent name="C:\Users\HP\IdeaProjects\omni-tools\src\tools" />
     </key>
   </component>
-  <component name="RunManager" selected="npm.dev">
-    <configuration name="JoinText Component" type="JavaScriptTestRunnerPlaywright" temporary="true" nameIsGenerated="true">
-      <node-interpreter value="project" />
-      <playwright-package value="$PROJECT_DIR$/node_modules/@playwright/test" />
-      <working-dir value="$PROJECT_DIR$" />
-      <envs />
-      <scope-kind value="SUITE" />
-      <test-file value="$PROJECT_DIR$/src/pages/string/join/string-join.e2e.spec.ts" />
-      <test-names>
-        <test-name value="JoinText Component" />
-      </test-names>
-      <method v="2" />
-    </configuration>
+  <component name="RunManager" selected="npm.test">
     <configuration name="JoinText Component.should merge text pieces with specified join character" type="JavaScriptTestRunnerPlaywright" temporary="true" nameIsGenerated="true">
       <node-interpreter value="project" />
       <playwright-package value="$PROJECT_DIR$/node_modules/@playwright/test" />
@@ -153,6 +143,16 @@
       <envs />
       <method v="2" />
     </configuration>
+    <configuration name="test" type="js.build_tools.npm" temporary="true" nameIsGenerated="true">
+      <package-json value="$PROJECT_DIR$/package.json" />
+      <command value="run" />
+      <scripts>
+        <script value="test" />
+      </scripts>
+      <node-interpreter value="project" />
+      <envs />
+      <method v="2" />
+    </configuration>
     <configuration name="test:e2e" type="js.build_tools.npm" temporary="true" nameIsGenerated="true">
       <package-json value="$PROJECT_DIR$/package.json" />
       <command value="run" />
@@ -165,11 +165,11 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="npm.test" />
         <item itemvalue="npm.dev" />
         <item itemvalue="npm.lint" />
         <item itemvalue="npm.test:e2e" />
         <item itemvalue="Playwright.JoinText Component.should merge text pieces with specified join character" />
-        <item itemvalue="Playwright.JoinText Component" />
       </list>
     </recent_temporary>
   </component>
@@ -609,7 +609,19 @@
       <map>
         <entry key="MAIN">
           <value>
-            <State />
+            <State>
+              <option name="FILTERS">
+                <map>
+                  <entry key="branch">
+                    <value>
+                      <list>
+                        <option value="origin/chesterkxng" />
+                      </list>
+                    </value>
+                  </entry>
+                </map>
+              </option>
+            </State>
           </value>
         </entry>
       </map>
diff --git a/package.json b/package.json
index dd3378a..225d647 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "test:e2e:run": "playwright test",
     "test:ui": "vitest --ui",
     "script:create:tool": "node scripts/create-tool.mjs",
-    "lint": "eslint src --max-warnings=0",
+    "lint": "eslint src --max-warnings=0 --fix",
     "typecheck": "tsc --project tsconfig.json --noEmit",
     "prepare": "husky install"
   },
diff --git a/src/pages/list/sort/index.tsx b/src/pages/list/sort/index.tsx
index 0ffb78b..d26c9ef 100644
--- a/src/pages/list/sort/index.tsx
+++ b/src/pages/list/sort/index.tsx
@@ -8,4 +8,4 @@ const validationSchema = Yup.object({
 });
 export default function Sort() {
   return <Box>Lorem ipsum</Box>;
-}
\ No newline at end of file
+}
diff --git a/src/pages/list/sort/meta.ts b/src/pages/list/sort/meta.ts
index b5afb37..46c7a90 100644
--- a/src/pages/list/sort/meta.ts
+++ b/src/pages/list/sort/meta.ts
@@ -10,4 +10,4 @@ export const tool = defineTool('list', {
   shortDescription: '',
   keywords: ['sort'],
   component: lazy(() => import('./index'))
-});
\ No newline at end of file
+});
diff --git a/src/pages/list/sort/service.ts b/src/pages/list/sort/service.ts
index 9822ef1..f6fb5fa 100644
--- a/src/pages/list/sort/service.ts
+++ b/src/pages/list/sort/service.ts
@@ -1,117 +1,123 @@
-import { isNumber } from "utils/string";
+import { isNumber } from 'utils/string';
+
 export type SortingMethod = 'numeric' | 'alphabetic' | 'length';
 export type SplitOperatorType = 'symbol' | 'regex';
 
 // utils function that choose the way of numeric sorting mixed types of array
 function customNumericSort(a: string, b: string, increasing: boolean): number {
-   
-    const formattedA = isNumber(a) ? Number(a) : a;
-    const formattedB = isNumber(b) ? Number(b) : b;
-    if (typeof formattedA === 'number' && typeof formattedB === 'number') {
-        let result: number = increasing ? (formattedA - formattedB) : (formattedB - formattedA);
-        return result;
-    } else if (typeof formattedA === 'string' && typeof formattedB === 'string') {
-        return formattedA.localeCompare(formattedB); // Lexicographical comparison for strings
-    } else if (typeof formattedA === 'number' && typeof formattedB === 'string') {
-        return -1; // Numbers before strings
-    } else {
-        return 1; // Strings after numbers
-    }
+  const formattedA = isNumber(a) ? Number(a) : a;
+  const formattedB = isNumber(b) ? Number(b) : b;
+  if (typeof formattedA === 'number' && typeof formattedB === 'number') {
+    return increasing ? formattedA - formattedB : formattedB - formattedA;
+  } else if (typeof formattedA === 'string' && typeof formattedB === 'string') {
+    return formattedA.localeCompare(formattedB); // Lexicographical comparison for strings
+  } else if (typeof formattedA === 'number' && typeof formattedB === 'string') {
+    return -1; // Numbers before strings
+  } else {
+    return 1; // Strings after numbers
+  }
 }
 
 export function numericSort(
-    array: string[], // array we build after parsing the input
-    increasing: boolean,
-    joinSeparator: string,
-    removeDuplicated: boolean // the value if the checkbox has been selected 1 else 0
+  array: string[], // array we build after parsing the input
+  increasing: boolean,
+  joinSeparator: string,
+  removeDuplicated: boolean // the value if the checkbox has been selected 1 else 0
 ) {
-    array.sort((a, b) => customNumericSort(a, b, increasing));
-    if (removeDuplicated) {
-        array = array.filter((item, index) => array.indexOf(item) === index);
-    }
-    return array.join(joinSeparator);
+  array.sort((a, b) => customNumericSort(a, b, increasing));
+  if (removeDuplicated) {
+    array = array.filter((item, index) => array.indexOf(item) === index);
+  }
+  return array.join(joinSeparator);
 }
 
 // utils function that choose the way of numeric sorting mixed types of array
 function customLengthSort(a: string, b: string, increasing: boolean): number {
-    let result: number = increasing ? (a.length - b.length) : (b.length - a.length);
-    return result;
+  return increasing ? a.length - b.length : b.length - a.length;
 }
 
 export function lengthSort(
-    array: string[], // array we build after parsing the input
-    increasing: boolean, // select value has to be increasing for increasing order and decreasing for decreasing order
-    joinSeparator: string,
-    removeDuplicated: boolean // the value if the checkbox has been selected 1 else 0
+  array: string[], // array we build after parsing the input
+  increasing: boolean, // select value has to be increasing for increasing order and decreasing for decreasing order
+  joinSeparator: string,
+  removeDuplicated: boolean // the value if the checkbox has been selected 1 else 0
 ) {
-    array.sort((a, b) => customLengthSort(a, b, increasing));
-    if (removeDuplicated) {
-        array = array.filter((item, index) => array.indexOf(item) === index);
-    }
-    return array.join(joinSeparator);
+  array.sort((a, b) => customLengthSort(a, b, increasing));
+  if (removeDuplicated) {
+    array = array.filter((item, index) => array.indexOf(item) === index);
+  }
+  return array.join(joinSeparator);
 }
 
 // Utils function that chooses the way of alphabetic sorting mixed types of array
-function customAlphabeticSort(a: string, b: string, caseSensitive: boolean): number {
-    if (!caseSensitive) {
-        // Case-insensitive comparison
-        return  a.toLowerCase().localeCompare(b.toLowerCase());
-    } else {
-        // Case-sensitive comparison
-        return a.charCodeAt(0) - b.charCodeAt(0);
-    }
+function customAlphabeticSort(
+  a: string,
+  b: string,
+  caseSensitive: boolean
+): number {
+  if (!caseSensitive) {
+    // Case-insensitive comparison
+    return a.toLowerCase().localeCompare(b.toLowerCase());
+  } else {
+    // Case-sensitive comparison
+    return a.charCodeAt(0) - b.charCodeAt(0);
+  }
 }
 
 export function alphabeticSort(
-    array: string[], // array we build after parsing the input
-    increasing: boolean, // select value has to be "increasing" for increasing order and "decreasing" for decreasing order
-    joinSeparator: string,
-    removeDuplicated: boolean, // the value if the checkbox has been selected 1 else 0
-    caseSensitive: boolean // the value if the checkbox has been selected 1 else 0
-) 
-{
-    array.sort((a, b) => customAlphabeticSort(a, b, caseSensitive));
-    if (!increasing){
-        array.reverse();
-    } 
-    if (removeDuplicated) {
-        array = array.filter((item, index) => array.indexOf(item) === index);
-    }
-    return array.join(joinSeparator);  
-}
-
-// main function 
-export function Sort(
-    sortingMethod: SortingMethod,
-    splitOperatorType: SplitOperatorType,
-    input: string, 
-    increasing: boolean,
-    splitSeparator: string,
-    joinSeparator: string,
-    removeDuplicated: boolean,
-    caseSensitive: boolean 
+  array: string[], // array we build after parsing the input
+  increasing: boolean, // select value has to be "increasing" for increasing order and "decreasing" for decreasing order
+  joinSeparator: string,
+  removeDuplicated: boolean, // the value if the checkbox has been selected 1 else 0
+  caseSensitive: boolean // the value if the checkbox has been selected 1 else 0
 ) {
-    let array: string[];
-    switch(splitOperatorType) {
-        case 'symbol':
-            array = input.split(splitSeparator);
-            break;
-        case 'regex':
-            array = input.split(new RegExp(splitSeparator));
-            break;
-    }
-    let result : string;
-    switch(sortingMethod) {
-        case 'numeric':
-            result = numericSort(array, increasing, joinSeparator, removeDuplicated);
-            break;
-        case 'length':
-            result = lengthSort(array, increasing, joinSeparator, removeDuplicated);
-            break;
-        case 'alphabetic':
-            result = alphabeticSort(array, increasing, joinSeparator, removeDuplicated, caseSensitive);
-            break;
-    }
-    return result;
+  array.sort((a, b) => customAlphabeticSort(a, b, caseSensitive));
+  if (!increasing) {
+    array.reverse();
+  }
+  if (removeDuplicated) {
+    array = array.filter((item, index) => array.indexOf(item) === index);
+  }
+  return array.join(joinSeparator);
 }
 
+// main function
+export function Sort(
+  sortingMethod: SortingMethod,
+  splitOperatorType: SplitOperatorType,
+  input: string,
+  increasing: boolean,
+  splitSeparator: string,
+  joinSeparator: string,
+  removeDuplicated: boolean,
+  caseSensitive: boolean
+) {
+  let array: string[];
+  switch (splitOperatorType) {
+    case 'symbol':
+      array = input.split(splitSeparator);
+      break;
+    case 'regex':
+      array = input.split(new RegExp(splitSeparator));
+      break;
+  }
+  let result: string;
+  switch (sortingMethod) {
+    case 'numeric':
+      result = numericSort(array, increasing, joinSeparator, removeDuplicated);
+      break;
+    case 'length':
+      result = lengthSort(array, increasing, joinSeparator, removeDuplicated);
+      break;
+    case 'alphabetic':
+      result = alphabeticSort(
+        array,
+        increasing,
+        joinSeparator,
+        removeDuplicated,
+        caseSensitive
+      );
+      break;
+  }
+  return result;
+}
diff --git a/src/pages/list/sort/sort.service.test.ts b/src/pages/list/sort/sort.service.test.ts
index 6d5a10e..de9c8df 100644
--- a/src/pages/list/sort/sort.service.test.ts
+++ b/src/pages/list/sort/sort.service.test.ts
@@ -1,39 +1,92 @@
 // Import necessary modules and functions
 import { describe, it, expect } from 'vitest';
 import {
-    alphabeticSort, lengthSort, numericSort, Sort,
-    SplitOperatorType, SortingMethod
+  alphabeticSort,
+  lengthSort,
+  numericSort,
+  Sort,
+  SplitOperatorType,
+  SortingMethod
 } from './service';
 
 // Define test cases for the numericSort function
 describe('numericSort function', () => {
-    it('should sort a list in increasing order with comma separator not removeduplicated elements', () => {
-        const array: string[] = ['9', '8', '7', '4', '2', '2', '5'];
-        const increasing: boolean = true;
-        const separator = ', ';
-        const removeDuplicated: boolean = false;
+  it('should sort a list in increasing order with comma separator not removeduplicated elements', () => {
+    const array: string[] = ['9', '8', '7', '4', '2', '2', '5'];
+    const increasing: boolean = true;
+    const separator = ', ';
+    const removeDuplicated: boolean = false;
 
-        const result = numericSort(array, increasing, separator, removeDuplicated);
-        expect(result).toBe('2, 2, 4, 5, 7, 8, 9');
-    });
+    const result = numericSort(array, increasing, separator, removeDuplicated);
+    expect(result).toBe('2, 2, 4, 5, 7, 8, 9');
+  });
 
-    it('should sort a list in decreasing order with " - " separator and remove duplicated elements', () => {
-        const array: string[] = ['2', '4', '4', '9', '6', '6', '7'];
-        const increasing: boolean = false;
-        const separator = ' - ';
-        const removeDuplicated: boolean = true;
+  it('should sort a list in decreasing order with " - " separator and remove duplicated elements', () => {
+    const array: string[] = ['2', '4', '4', '9', '6', '6', '7'];
+    const increasing: boolean = false;
+    const separator = ' - ';
+    const removeDuplicated: boolean = true;
+
+    const result = numericSort(array, increasing, separator, removeDuplicated);
+    expect(result).toBe('9 - 7 - 6 - 4 - 2');
+  });
+
+  it('should sort a list with numbers and characters and remove duplicated elements', () => {
+    const array: string[] = ['d', 'd', 'n', 'p', 'h', 'h', '6', '9', '7', '5'];
+    const increasing: boolean = true;
+    const separator = ' ';
+    const removeDuplicated: boolean = true;
+
+    const result = numericSort(array, increasing, separator, removeDuplicated);
+    expect(result).toBe('5 6 7 9 d h n p');
+  });
+
+  // Define test cases for the lengthSort function
+  describe('lengthSort function', () => {
+    it('should sort a list of number by length in increasing order with comma separator ', () => {
+      const array: string[] = ['415689521', '3', '126', '12', '1523'];
+      const increasing: boolean = true;
+      const separator = ', ';
+      const removeDuplicated: boolean = false;
 
       const result = lengthSort(array, increasing, separator, removeDuplicated);
       expect(result).toBe('3, 12, 126, 1523, 415689521');
     });
 
-    it('should sort a list with numbers and characters and remove duplicated elements', () => {
-        const array: string[] = ['d', 'd', 'n', 'p', 'h', 'h', '6', '9', '7', '5'];
-        const increasing: boolean = true;
-        const separator = ' ';
-        const removeDuplicated: boolean = true;
+    it('should sort a list of number by length in increasing order and remove duplicated elements ', () => {
+      const array: string[] = [
+        '415689521',
+        '3',
+        '3',
+        '126',
+        '12',
+        '12',
+        '1523'
+      ];
+      const increasing: boolean = true;
+      const separator = ', ';
+      const removeDuplicated: boolean = true;
 
+      const result = lengthSort(array, increasing, separator, removeDuplicated);
+      expect(result).toBe('3, 12, 126, 1523, 415689521');
+    });
 
+    it('should sort a mixed array by length in increasing order ', () => {
+      const array: string[] = [
+        'ddd',
+        'd',
+        'nfg',
+        'p',
+        'h',
+        'h',
+        '6555',
+        '9',
+        '7',
+        '5556'
+      ];
+      const increasing: boolean = true;
+      const separator = ' ';
+      const removeDuplicated: boolean = true;
 
       const result = lengthSort(array, increasing, separator, removeDuplicated);
       expect(result).toBe('d p h 9 7 ddd nfg 6555 5556');
@@ -44,7 +97,7 @@ describe('numericSort function', () => {
   describe('alphabeticSort function', () => {
     // NON CASE SENSITIVE TEST
     it('should sort a list of string in increasing order with comma separator ', () => {
-      const array: any[] = ['apple', 'pineaple', 'lemon', 'orange'];
+      const array: string[] = ['apple', 'pineaple', 'lemon', 'orange'];
       const increasing: boolean = true;
       const separator = ', ';
       const removeDuplicated: boolean = false;
@@ -60,47 +113,31 @@ describe('numericSort function', () => {
       expect(result).toBe('apple, lemon, orange, pineaple');
     });
 
-    // Define test cases for the lengthSort function
-    describe('lengthSort function', () => {
-        it('should sort a list of number by length in increasing order with comma separator ', () => {
-            const array: string[] = ['415689521', '3', '126', '12', '1523'];
-            const increasing: boolean = true;
-            const separator = ', ';
-            const removeDuplicated: boolean = false;
-
-            const result = lengthSort(array, increasing, separator, removeDuplicated);
-            expect(result).toBe('3, 12, 126, 1523, 415689521');
-        });
-
-        it('should sort a list of number by length in increasing order and remove duplicated elements ', () => {
-            const array: string[] = ['415689521', '3', '3', '126', '12', '12', '1523'];
-            const increasing: boolean = true;
-            const separator = ', ';
-            const removeDuplicated: boolean = true;
-
-            const result = lengthSort(array, increasing, separator, removeDuplicated);
-            expect(result).toBe('3, 12, 126, 1523, 415689521');
-        });
-
-        it('should sort a mixed array by length in increasing order ', () => {
-            const array: string[] = ['ddd', 'd', 'nfg', 'p', 'h', 'h', '6555', '9', '7', '5556'];
-            const increasing: boolean = true;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-
-            const result = lengthSort(array, increasing, separator, removeDuplicated);
-            expect(result).toBe('d p h 9 7 ddd nfg 6555 5556');
-        });
+    it('should sort a list of string in decreasing order with comma separator ', () => {
+      const array: string[] = ['apple', 'pineaple', 'lemon', 'orange'];
+      const increasing: boolean = false;
+      const separator = ', ';
+      const removeDuplicated: boolean = false;
+      const caseSensitive: boolean = false;
 
+      const result = alphabeticSort(
+        array,
+        increasing,
+        separator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('pineaple, orange, lemon, apple');
+    });
 
     it('should sort a list of string and symbols (uppercase and lower) in increasing order with comma separator ', () => {
-      const array: any[] = [
+      const array: string[] = [
         'Apple',
         'pineaple',
         'lemon',
         'Orange',
-        1,
-        9,
+        '1',
+        '9',
         '@',
         '+'
       ];
@@ -120,13 +157,13 @@ describe('numericSort function', () => {
     });
 
     it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-      const array: any[] = [
+      const array: string[] = [
         'Apple',
         'pineaple',
         'lemon',
         'Orange',
-        1,
-        9,
+        '1',
+        '9',
         '@',
         '+'
       ];
@@ -145,150 +182,80 @@ describe('numericSort function', () => {
       expect(result).toBe('pineaple Orange lemon Apple 9 1 + @');
     });
 
-    // Define test cases for the alphabeticSort function
-    describe('alphabeticSort function', () => {
-        // NON CASE SENSITIVE TEST
-        it('should sort a list of string in increasing order with comma separator ', () => {
-            const array: string[] = ['apple', 'pineaple', 'lemon', 'orange'];
-            const increasing: boolean = true;
-            const separator = ', ';
-            const removeDuplicated: boolean = false;
-            const caseSensitive: boolean = false;
+    // CASE SENSITIVE TEST
+    it('should sort a list of string (uppercase) in decreasing order with comma separator ', () => {
+      const array: string[] = ['Apple', 'Pineaple', 'Lemon', 'Orange'];
+      const increasing: boolean = false;
+      const separator = ' ';
+      const removeDuplicated: boolean = false;
+      const caseSensitive: boolean = true;
 
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('apple, lemon, orange, pineaple');
-        });
-
-        it('should sort a list of string in decreasing order with comma separator ', () => {
-            const array: string[] = ['apple', 'pineaple', 'lemon', 'orange'];
-            const increasing: boolean = false;
-            const separator = ', ';
-            const removeDuplicated: boolean = false;
-            const caseSensitive: boolean = false;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('pineaple, orange, lemon, apple');
-        });
-
-        it('should sort a list of string and symbols (uppercase and lower) in increasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9', '@', '+'];
-            const increasing: boolean = true;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = false;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('@ + 1 9 Apple lemon Orange pineaple');
-        });
-
-        it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9', '@', '+'];
-            const increasing: boolean = false;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = false;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('pineaple Orange lemon Apple 9 1 + @');
-        });
-
-
-        // CASE SENSITIVE TEST
-        it('should sort a list of string (uppercase) in decreasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'Pineaple', 'Lemon', 'Orange'];
-            const increasing: boolean = false;
-            const separator = ' ';
-            const removeDuplicated: boolean = false;
-            const caseSensitive: boolean = true;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('Pineaple Orange Lemon Apple');
-        });
-
-        it('should sort a list of string (uppercase and lowercase) in increasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9'];
-            const increasing: boolean = true;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('1 9 Apple Orange lemon pineaple');
-        });
-
-        it('should sort a list of string (uppercase and lower) in decreasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9'];
-            const increasing: boolean = false;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('pineaple lemon Orange Apple 9 1');
-        });
-
-        it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9', '@', '+'];
-            const increasing: boolean = true;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('+ 1 9 @ Apple Orange lemon pineaple');
-        });
-
-        it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-            const array: string[] = ['Apple', 'pineaple', 'lemon', 'Orange', '1', '9', '@', '+'];
-            const increasing: boolean = false;
-            const separator = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = alphabeticSort(array, increasing, separator, removeDuplicated, caseSensitive);
-            expect(result).toBe('pineaple lemon Orange Apple @ 9 1 +');
-        });
+      const result = alphabeticSort(
+        array,
+        increasing,
+        separator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('Pineaple Orange Lemon Apple');
     });
 
-    // Define test cases for the lengthSort function
-    describe('main function', () => {
-        it('should do everything alph', () => {
-            const sortingMethod: SortingMethod = 'alphabetic';
-            const splitOperatorType : SplitOperatorType = 'symbol';
-            const input: string = 'Apple pineaple lemon Orange 1 9 @ +';
-            const increasing: boolean = true;
-            const splitSeparator: string = ' ';
-            const joinSeparator: string = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = Sort(sortingMethod, splitOperatorType, input, increasing, splitSeparator, joinSeparator, removeDuplicated, caseSensitive);
-            expect(result).toBe('+ 1 9 @ Apple Orange lemon pineaple');
-        });
-
-        it('should do everything numeric', () => {
-            const sortingMethod: SortingMethod = 'numeric';
-            const splitOperatorType : SplitOperatorType = 'symbol';
-            const input: string = '1 6 9 4 6 7 3 5 8';
-            const increasing: boolean = true;
-            const splitSeparator: string = ' ';
-            const joinSeparator: string = ' ';
-            const removeDuplicated: boolean = true;
-            const caseSensitive: boolean = true;
-
-            const result = Sort(sortingMethod, splitOperatorType, input, increasing, splitSeparator, joinSeparator, removeDuplicated, caseSensitive);
-            expect(result).toBe('1 3 4 5 6 7 8 9');
-        });
-
-
-    it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-      const array: any[] = [
+    it('should sort a list of string (uppercase and lowercase) in increasing order with comma separator ', () => {
+      const array: string[] = [
         'Apple',
         'pineaple',
         'lemon',
         'Orange',
-        1,
-        9,
+        '1',
+        '9'
+      ];
+      const increasing: boolean = true;
+      const separator = ' ';
+      const removeDuplicated: boolean = true;
+      const caseSensitive: boolean = true;
+
+      const result = alphabeticSort(
+        array,
+        increasing,
+        separator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('1 9 Apple Orange lemon pineaple');
+    });
+
+    it('should sort a list of string (uppercase and lower) in decreasing order with comma separator ', () => {
+      const array: string[] = [
+        'Apple',
+        'pineaple',
+        'lemon',
+        'Orange',
+        '1',
+        '9'
+      ];
+      const increasing: boolean = false;
+      const separator = ' ';
+      const removeDuplicated: boolean = true;
+      const caseSensitive: boolean = true;
+
+      const result = alphabeticSort(
+        array,
+        increasing,
+        separator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('pineaple lemon Orange Apple 9 1');
+    });
+
+    it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
+      const array: string[] = [
+        'Apple',
+        'pineaple',
+        'lemon',
+        'Orange',
+        '1',
+        '9',
         '@',
         '+'
       ];
@@ -308,13 +275,13 @@ describe('numericSort function', () => {
     });
 
     it('should sort a list of string and symbols (uppercase and lower) in decreasing order with comma separator ', () => {
-      const array: any[] = [
+      const array: string[] = [
         'Apple',
         'pineaple',
         'lemon',
         'Orange',
-        1,
-        9,
+        '1',
+        '9',
         '@',
         '+'
       ];
@@ -332,5 +299,54 @@ describe('numericSort function', () => {
       );
       expect(result).toBe('pineaple lemon Orange Apple @ 9 1 +');
     });
+  });
 
+  // Define test cases for the lengthSort function
+  describe('main function', () => {
+    it('should do everything alph', () => {
+      const sortingMethod: SortingMethod = 'alphabetic';
+      const splitOperatorType: SplitOperatorType = 'symbol';
+      const input: string = 'Apple pineaple lemon Orange 1 9 @ +';
+      const increasing: boolean = true;
+      const splitSeparator: string = ' ';
+      const joinSeparator: string = ' ';
+      const removeDuplicated: boolean = true;
+      const caseSensitive: boolean = true;
+
+      const result = Sort(
+        sortingMethod,
+        splitOperatorType,
+        input,
+        increasing,
+        splitSeparator,
+        joinSeparator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('+ 1 9 @ Apple Orange lemon pineaple');
+    });
+
+    it('should do everything numeric', () => {
+      const sortingMethod: SortingMethod = 'numeric';
+      const splitOperatorType: SplitOperatorType = 'symbol';
+      const input: string = '1 6 9 4 6 7 3 5 8';
+      const increasing: boolean = true;
+      const splitSeparator: string = ' ';
+      const joinSeparator: string = ' ';
+      const removeDuplicated: boolean = true;
+      const caseSensitive: boolean = true;
+
+      const result = Sort(
+        sortingMethod,
+        splitOperatorType,
+        input,
+        increasing,
+        splitSeparator,
+        joinSeparator,
+        removeDuplicated,
+        caseSensitive
+      );
+      expect(result).toBe('1 3 4 5 6 7 8 9');
+    });
+  });
 });
diff --git a/src/utils/string.ts b/src/utils/string.ts
index 785aa00..d2e4e8f 100644
--- a/src/utils/string.ts
+++ b/src/utils/string.ts
@@ -5,4 +5,4 @@ export function capitalizeFirstLetter(string: string | undefined) {
 
 export function isNumber(number: any) {
   return !isNaN(parseFloat(number)) && isFinite(number);
-}
\ No newline at end of file
+}