Make The String Great LeetCode solution in Java

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class Solution {
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  public String makeGood(String s) {
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    char[] res = s.toCharArray();
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    int i = 0;
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    for (char n : s.toCharArray()) {
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      res[i] = n;
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      if (i > 0 && Math.abs((int) res[i - 1] - (int) res[i]) == 32) {
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        i -= 2;
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      }
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      i++;
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    }
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    return new String(res, 0, i);
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  }
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}