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

struct ImportantExcerpt<'a> {
    part: &'a str,
}

fn main() {
    let x = String::from("abcd");
    let result;
    let y = String::from("x7z");
    result = longest(x.as_str(), y.as_str());
    println!("The longest string is {}", result);
}