Bulls and Cows LeetCode solution in Rust

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impl Solution {
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  pub fn get_hint(secret: String, guess: String) -> String {
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    let (mut a, mut b) = (0, 0);
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    let mut d1 = [0; 10];
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    let mut d2 = [0; 10];
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    for (s, g) in secret.as_bytes().iter().zip(guess.as_bytes()) {
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      if s == g {
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        a += 1;
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      } else {
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        d1[(s - b'0') as usize] += 1;
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        d2[(g - b'0') as usize] += 1;
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      }
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    }
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    for i in 0..10 {
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      b += std::cmp::min(d1[i], d2[i]);
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    }
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    format!("{}A{}B", a, b)
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  }
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}