/*
trait Registry {
    fn register(message: Credentials) -> RegisterStatus;
    fn my_username() -> String;
    fn tell_back(message: String) -> Result<String, TellBackError>;
}

#[derive(ValidatorStringBounds<[u8; 8]>)]
struct Credentials {

}

struct RegisterStatus {

}

struct TellBackError {

}
*/

fn main() { todo!() }