// utility function to get a randomly generated string
// of size len
pub fn get_random(len: usize) -> String {
    use std::iter;

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

    let mut rng: ThreadRng = thread_rng();

    iter::repeat(())
        .map(|()| rng.sample(Alphanumeric))
        .map(char::from)
        .take(len)
        .collect::<String>()
}