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pub fn random_id(len: usize) -> String {
use rand::distributions::Slice;
use rand::Rng;
static ALPHABET: &[u8] = b"abcdefghijklmnopqrstuvwxyz0123456789.";
let rng = rand::thread_rng();
rng.sample_iter(Slice::new(ALPHABET).unwrap())
.map(|b| char::from(*b))
.filter(|c| c.is_ascii_lowercase() || c.is_ascii_digit())
.take(len)
.collect()
}
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