fn main() {
    println!("Hello, world!");
}

struct Solution;

impl Solution {
    pub fn is_palindrome(mut s: String) -> bool {
        let str: Vec<u8> = unsafe { s.as_bytes_mut() }.iter_mut().filter(|x| x.is_ascii_alphanumeric()).map(|x| x.to_ascii_lowercase()).collect();
        str.iter().take(str.len() / 2).eq(str.iter().rev().take(str.len() / 2))
    }
}