Find Words That Can Be Formed by Characters LeetCode solution in Rust

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impl Solution {
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  pub fn count_characters(words: Vec<String>, chars: String) -> i32 {
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    let mut bank = [0; 26];
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    for i in chars.as_bytes() {
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      bank[*i as usize - 'a' as usize] += 1;
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    }
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    let bank = bank; // make immutable
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    let mut ans = 0;
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    'out: for w in words.iter() {
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      let mut bank = bank;
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      for i in w.as_bytes() {
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        let idx = *i as usize - 'a' as usize;
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        bank[idx] -= 1;
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        if bank[idx] < 0 {
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          continue 'out;
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        }
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      }
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      ans += w.len();
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    }
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    ans as i32
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  }
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}