fn main() {
    let a = Data{ value: 1 };
    println!("This is a {:?}", a);
    one(a);
    println!("This is a {:?}", a);
    two(a);
    println!("This is a {:?}", a);

}

#[derive(Debug)]
struct Data {
    value : i32
}

fn one(num: Data) -> () {
    let side_effect = num.value + 1;
    println!("this is the side effect {}", side_effect);
}

fn two(num: Data) -> () {
    let side_effect = num.value + 1;
    println!("this is the side effect {}", side_effect);
}