gistfile1.rs

fn update_last_seen(last_seen_hash: &mut HashMap<String, SystemTime>, nickname: &str) {
    let time_now = SystemTime::now();
    let mut last_seen_entry = last_seen_hash.entry(String::from(nickname)).or_insert(time_now);
    *last_seen_entry = time_now;
    println!("Updating {} in the last seen DB at {:?}", nickname, time_now);
    println!("I'm now tracking {:?} people", last_seen_hash.len())
}