#[derive(Debug)]
struct User {
    username: String,
    email: String,
    sign_in_count: u64,
    active: bool,
}

impl User { // in this block, you can add methods to the struct
    fn new(username: String) -> User { // static method, works like a constructor
        User {
            email: format!("{}@user.com", &username), // use the & operator to only borrow the string
            username: username, // after that, give (move) the name to it's user
            sign_in_count: 1,
            active: true,
        }
    }
}

fn main() {
    // there are methods to avoid this .to_string(), but it's ok for the beginning.
    let u1 = User::new("Chuck Norris".to_string());
    println!("Hello {:?}", u1)
}