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use rand::Rng;
pub fn generate(rng: &mut rand::rngs::ThreadRng) -> String {
let mut digits: Vec<u8> = (0..9).map(|_| rng.gen_range(0..=9)).collect();
if digits[0] == 0 {
digits[0] = 1;
}
let mut s = 0;
for i in 1..=9 {
let n = digits[9 - i] as i32;
let c1 = (n + i as i32) % 10;
if c1 != 0 {
let mut c2 = (c1 * (1 << i)) % 9;
if c2 == 0 {
c2 = 9;
}
s += c2;
}
}
let check = (10 - (s % 10)) % 10;
digits.push(check as u8);
digits.iter().map(|d| (b'0' + d) as char).collect()
}
pub fn validate(code: &str) -> bool {
let clean: String = code.chars().filter(|c| c.is_ascii_digit()).collect();
if clean.len() != 10 {
return false;
}
let digits: Vec<u8> = clean.bytes().map(|b| b - b'0').collect();
let mut s = 0;
for i in 1..=9 {
let n = digits[9 - i] as i32;
let c1 = (n + i as i32) % 10;
if c1 != 0 {
let mut c2 = (c1 * (1 << i)) % 9;
if c2 == 0 {
c2 = 9;
}
s += c2;
}
}
let expected = (10 - (s % 10)) % 10;
digits[9] == expected as u8
}