refactor: tools folder inside pages

src/pages/tools/string/create-palindrome/service.ts

@@ -0,0 +1,36 @@
+import { reverseString } from 'utils/string';
+
+export function createPalindrome(
+  input: string,
+  lastChar: boolean // only checkbox is need here to handle it [instead of two combo boxes]
+) {
+  if (!input) return '';
+  let result: string;
+  let reversedString: string;
+
+  // reverse the whole input if lastChar enabled
+  reversedString = lastChar
+    ? reverseString(input)
+    : reverseString(input.slice(0, -1));
+  result = input.concat(reversedString);
+  return result;
+}
+
+export function createPalindromeList(
+  input: string,
+  lastChar: boolean,
+  multiLine: boolean
+): string {
+  if (!input) return '';
+  let array: string[];
+  const result: string[] = [];
+
+  if (!multiLine) return createPalindrome(input, lastChar);
+  else {
+    array = input.split('\n');
+    for (const word of array) {
+      result.push(createPalindrome(word, lastChar));
+    }
+  }
+  return result.join('\n');
+}