public class Solution {

public static boolean isPalindrome(String str) {

// base case

int i=0;

boolean result = palin(str,i);

return result;

}

public static boolean palin(String str, int i){

// base case

int n = str.length();

if(i >= n/2) return true;

if(str.charAt(i) != str.charAt(n-i-1)) return false;

i++;

return palin(str,i);

}

}