fn test_fib<T: Fibonacci>(gen: &T) {
    let start_time = Local::now();
    let REPETITIONS = 50;
    let DEPTH = 35;
    for _ in 0..REPETITIONS {
        for number in 0..DEPTH {
            print_fib(gen, number);
        }
    }

    let duration = Local::now().timestamp_millis() - start_time.timestamp_millis();
    println!(
        "{} * {} fibonacci numbers took {} milliseconds",
        REPETITIONS, DEPTH, duration
    );
}

// vs



const REPETITIONS: usize = 50;
const DEPTH: usize = 35;
fn test_fib<T: Fibonacci>(gen: &T) {
    let start_time = Local::now();
    for _ in 0..REPETITIONS {
        for number in 0..DEPTH {
            print_fib(gen, number);
        }
    }

    let duration = Local::now().timestamp_millis() - start_time.timestamp_millis();
    println!(
        "{} * {} fibonacci numbers took {} milliseconds",
        REPETITIONS, DEPTH, duration
    );
}