LeetCode 680: Valid Palindromes

class Solution {
    public boolean validPalindrome(String s) {
        int start = 0, end = s.length() - 1;
        boolean found = false;
        while (start < end) {
            if (s.charAt(start) != s.charAt(end)) {
                return isPal(s, start, end - 1) || isPal(s, start + 1, end);
            }
            start++;
            end--;
        }
        return true;
    }
    
    private boolean isPal(String s, int start, int end) {
        while (start < end) {
            if (s.charAt(start) != s.charAt(end)) {
                return false;
            }
            start++;
            end--;
        }
        return true;
    }
}