Is Palindrome

Problem

Given a string s, return true if it is a palindrome, and false otherwise.

A palindrome is a string that reads the same backward as forward.

Examples:

isPalindrome("racecar")
// true
// The string "racecar" reads the same backward as forward.

isPalindrome("hello")
// false
// The string "hello" does not read the same backward as forward.

isPalindrome("radar")
// true
// The string "radar" reads the same backward as forward.