#![allow(unused_variables)]
fn main() {
    let s = "hello";
    assert_eq!(s.len(), 5);
    let s = ['h', 'e', 'l', 'l', 'o'];
    let size: usize = s.into_iter().map(|c| size_of_val(&c)).sum();
    assert_eq!(size, 20);
    let s = "💖💖💖💖💖";
    assert_eq!(s.len(), 20);
    let s = ['💖', '💖', '💖', '💖', '💖'];
    let size: usize = s.into_iter().map(|c| size_of_val(&c)).sum();
    assert_eq!(size, 20);
}