fn main() {
    let mut m = String::from("Hello");
    println!("{}",m);

    m.push_str(" World");
    println!("{}",m);

    let p = ", World";
    let l = m + &p;
    println!("{}",l);

    let z = "tic";
    let x = "tac";
    let c = "toe";

    let s = format!("{z}-{x}{c}");
    println!("{s}");
}