Resolve merge conflict in checkPalindrome function

Author: mohmmadAyesh

String/CheckPalindrome.js

@@ -1,7 +1,7 @@
 /**
  * Checks if a string is a palindrome.
  * A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
- * Palindrome check is case sensitive; i.e., "Aba" is not considered a palindrome. 
+ * Palindrome check is case sensitive; i.e., "Aba" is not considered a palindrome.
  * @param {string} str The input string to be checked for palindrome.
  * @returns {string} Returns 'Palindrome' if the input string is a palindrome,
  * 'Not a Palindrome' if it is not, or an error message if the input is not a valid string.