create palindrome tool, testCases and undated index file

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

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+import { expect, describe, it } from 'vitest';
+ import { createPalindromeList, createPalindrome } from './service';
+
+describe('createPalindrome', () => {
+    test('should create palindrome by reversing the entire string', () => {
+        const input = 'hello';
+        const result = createPalindrome(input, true);
+        expect(result).toBe('helloolleh');
+    });
+
+    test('should create palindrome by reversing the string excluding the last character', () => {
+        const input = 'hello';
+        const result = createPalindrome(input, false);
+        expect(result).toBe('hellolleh');
+    });
+
+    test('should return an empty string if input is empty', () => {
+        const input = '';
+        const result = createPalindrome(input, true);
+        expect(result).toBe('');
+    });
+});
+
+describe('createPalindromeList', () => {
+    test('should create palindrome for single-line input', () => {
+        const input = 'hello';
+        const result = createPalindromeList(input, true, false);
+        expect(result).toBe('helloolleh');
+    });
+
+    test('should create palindrome for single-line input considering trailing spaces', () => {
+        const input = 'hello ';
+        const result = createPalindromeList(input, true, false);
+        expect(result).toBe('hello  olleh');
+    });
+
+    test('should create palindrome for single-line input ignoring trailing spaces if lastChar is set to false', () => {
+        const input = 'hello ';
+        const result = createPalindromeList(input, true, false);
+        expect(result).toBe('hello  olleh');
+    });
+
+    test('should create palindrome for multi-line input', () => {
+        const input = 'hello\nworld';
+        const result = createPalindromeList(input, true, true);
+        expect(result).toBe('helloolleh\nworlddlrow');
+    });
+
+    test('should create palindrome for no multi-line input', () => {
+        const input = 'hello\nworld\n';
+        const result = createPalindromeList(input, true, false);
+        expect(result).toBe('hello\nworld\n\ndlrow\nolleh');
+    });
+
+    test('should handle multi-line input with lastChar set to false', () => {
+        const input = 'hello\nworld';
+        const result = createPalindromeList(input, false, true);
+        expect(result).toBe('hellolleh\nworldlrow');
+    });
+
+    test('should return an empty string if input is empty', () => {
+        const input = '';
+        const result = createPalindromeList(input, true, false);
+        expect(result).toBe('');
+    });
+});