fn main() {
    use rand::Rng;
    const CHARSET: &[u8] = b"ABCDEFGHJKLMNPQRSTUVWXYZ\
                            abcdefghijkmnpqrstuvwxyz\
                            0123456789)(*&^%$#@!~ ";
    const PASSWORD_LEN: usize = 20;
    let mut rng = rand::thread_rng();

    let password: String = (0..PASSWORD_LEN)
        .map(|_| {
            let idx = rng.gen_range(0..CHARSET.len());
            CHARSET[idx] as char
        })
        .collect();

//    println!("{:?}", password);
    println!("{}", password);
}