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Remove unnecessary code (#4141)
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@ -40,7 +40,7 @@ public class RemoveDuplicateFromString {
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for (int i = 0; i < n; i++) {
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if (sb.toString().indexOf(s.charAt(i)) == -1) {
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sb.append(String.valueOf(s.charAt(i)));
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sb.append(s.charAt(i));
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}
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}
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