Valid Palindrome

A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.

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

function IsPalindromeValid(string) {
    let left = 0
    let right = string.length - 1;

    while (left < right) {
        if (string[left] === ' ') {
            left++;
            continue;
        } else if (string[right] === ' ') {
            right--;
            continue;
        }

        if (string[left] !== string[right]) {
            return false
        }

        left++;
        right--;
    }


    return true;
}

Input: s = "A man, a plan, a canal: Panama"
Output: true
Explanation: "amanaplanacanalpanama" is a palindrome.


Input: s = "race a car"
Output: false
Explanation: "raceacar" is not a palindrome.