use rand::Rng;
const CHARSET: &[u8] = b"abcdefghijklmnopqrstuvwxyz";
const PASSWORD_LEN: usize = 10;
pub fn gen_rand_str() -> String {
let mut rng = rand::thread_rng();
(0..PASSWORD_LEN)
.map(|_| {
let idx = rng.gen_range(0..CHARSET.len());
CHARSET[idx] as char
})
.collect()
}