use rand::Rng;
use rand::seq::SliceRandom;

fn generate_password(len: usize) -> String {
    const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%";
    let mut rng = rand::thread_rng();
    (0..len)
        .map(|_| CHARSET[rng.gen_range(0..CHARSET.len())] as char)
        .collect()
}

fn main() {
    println!("{}", generate_password(16));
}