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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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