Palindrome Pointers

The validator says "racecar" and "abba" are not palindromes.

isPalindrome(s) returns true if s reads the same forwards and backwards.

Fix the code so every test passes. Keep the function name isPalindrome.

Test cases

• isPalindrome("racecar") → true
• isPalindrome("abca") → false
• isPalindrome("") → true
• isPalindrome("abba") → true

Stuck? Hints go from a nudge to the exact fix.