#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let chars = ['g', 'd', 'k', 'k', 'n'];
    let hello: String = chars
        .into_iter()
        .map(|x| x as u8)
        .map(|x| (x + 1) as char)
        .collect();
    assert_eq!("hello", hello);
}