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2 months ago
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class Solution {
    public String makeGood(String s) {
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < s.length(); i++) {
            if (sb.length() > 0 && Math.abs(s.charAt(i) - sb.charAt(sb.length() - 1)) == 32) {
                sb.deleteCharAt(sb.length() - 1);
            } else {
                sb.append(s.charAt(i));
            }
        }

        return sb.toString();
    }
}
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