Drill 18: Inputs and outputs — Ownership and borrowing

fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
    if a.len() >= b.len() { a } else { b }
}

fn main() {
    let title = String::from("Rust Foundations");
    let borrowed = &title;
    println!("{}", longest(borrowed, "Go"));
    println!("{}", title);
}