Program not running

#1

program is successfully running on my pc but on submitting it is failing some test case but I have tried most of the test case on my pc and the program didn’t show any error.

#2

Your program should return wrong answer for cases when a certain character occurs more than 2 times consecutively. For e.g. take input string equal to “abbbc”, your program should return “abbc” while the correct answer is “abc”

#3

did some changes but still failing

#4

try this:

static String duplicateChar(String s) {
        if (s.length() <= 1) {
            return s;
        }

        String ros = duplicateChar(s.substring(1));

        if (s.charAt(0) == ros.charAt(0)) {
            return  ros;
        }

        return s.charAt(0) + ros;
    }