// Is Palindrome String — EASY

// Category: two-pointers

Given a string `s`, return `true` if it is a palindrome (reads the same forwards and backwards), or `false` otherwise.

A palindrome ignores case — `"Racecar"` is a palindrome. Only consider alphanumeric characters and ignore all others.

Hint: Use two pointers starting at each end and compare characters, skipping non-alphanumeric ones.

Example: s = "racecar"

Output: true