#[test]
fn test_saturating_sub() {
    let a: usize = 10;
    dbg!(a.saturating_sub(5));
    dbg!(a.saturating_sub(10));
    dbg!(a.saturating_sub(15));
}

#[test]
fn test_remainder() {
    dbg!(-6 % 5);
    dbg!(6 % 5);
    dbg!(6.3 % 5.0);
}