struct Name {
    name: String,
}

impl Name {
    fn new(name: &str) -> Self {
        Name { name: name.into() }
    }
}

trait Greeting {
    fn greet(&self) -> String;
}

impl Greeting for Name {
    fn greet(&self) -> String {
        format!("Hello, {}!", self.name)
    }
}

fn main() {
    println!("{}", Name::new("World").greet());
}