Minimum Swaps to Make Strings Equal LeetCode solution in Rust

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impl Solution {
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  pub fn minimum_swap(s1: String, s2: String) -> i32 {
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    let mut x1 = 0;
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    let mut y1 = 0;
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    for (c1, c2) in s1.chars().zip(s2.chars()) {
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      if c1 == 'x' && c2 == 'y' {
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        x1 += 1;
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      } else if c1 == 'y' && c2 == 'x' {
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        y1 += 1;
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      }
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    }
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    let mut ans = 0;
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    if x1 % 2 == 1 && y1 % 2 == 1 {
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      ans += 2;
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      x1 -= 1;
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      y1 -= 1;
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    }
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    ans += x1 / 2 + y1 / 2;
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    if x1 % 2 == 1 || y1 % 2 == 1 {
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      return -1;
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    }
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    ans
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  }
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}