remove 3 duplicates

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private static void remove(String s) {        if (s == null || s.length() == 0) {            return;        }        StringBuilder sb = new StringBuilder();        Stack<Character> st1 = new Stack<>();        Stack<Integer> st2 = new Stack<>();        for (char c : s.toCharArray()) {           if (!st2.isEmpty() && c != st1.peek() && st2.peek() >= 3) {                st1.pop();                st2.pop();            }            if (st2.isEmpty()) {                st1.push(c);                st2.push(1);            } else if (c == st1.peek()) {                int cnt = st2.pop();                cnt++;                st2.push(cnt);            } else {                st1.push(c);                st2.push(1);            }        }        if (!st2.isEmpty() && st2.peek() >= 3) {            st1.pop();            st2.pop();        }        while (!st2.isEmpty()) {            int cnt = st2.pop();            char c = st1.pop();            for (int i = 0; i < cnt; i++) {                sb.append(c);            }        }        System.out.println(sb.reverse().toString());    }

  

remove 3 duplicates

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