A phrase is a palindrome if, after converting all uppercase characters into lowercase characters 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.
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.
1 ≤ s.length ≤ 2 * 10⁵s consists only of printable ASCII characters.A man, a plan, a canal: Panama
true