1249. Minimum remove to make valid parentheses

//1249. Minimum remove to make valid parentheses

class Solution {
    public String minRemoveToMakeValid(String s) {
        int startPointer = 0;
        int endPointer = s.length() - 1;
        String startPart = "";
        String endPart = "";
        String result;
        char[] arr = s.toCharArray();
        int openParenthesesCount = 0;

        for(int i = 0; i < arr.length; i++) {
            if(arr[i] == '(')
                openParenthesesCount++;
            else if(arr[i] == ')') {
                if(openParenthesesCount == 0)
                    arr[i] = '*';
                else
                    openParenthesesCount--;
            }
        }

        for(int i = arr.length - 1; i >= 0; i--) {
            if(openParenthesesCount > 0 && arr[i] == '(') {
                arr[i] = '*';
                openParenthesesCount--;
            }
        }
        
        int p = 0;
        
        for(int i = 0; i < arr.length; i++) {
            if(arr[i] != '*')
                arr[p++] = arr[i];
        }

        result = new String(arr).substring(0, p);

        return result;
    }
}