Generate passwords restricted

Giovanny Gongora

from a set of user defined characters

use rand::{thread_rng, Rng};
use rand::distributions::Alphanumeric;

fn main() {
  use rand::Rng;
  const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
    abcdefghijklmnopqrstuvwxyz\
    0123456789)(*&^%$#@!~";
  const PASSWORD_LEN: usize = 30;
  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);
}