IBM.java

package com.roopesh;

public class Main {
    public static void main(String[] args) {
        int ans = closureSum(6583);
        System.out.println(ans);
    }
  
    public static int closureSum(int val) {
        char[] chars = ("" + val).toCharArray();
        int start = 0;
        int end = chars.length - 1;
        int ans = 0;

        while(start < end) {
           int temp = chars[start] + chars[end];
           ans += temp;
           start++;
           end--;
        }

        if(start == end) {
            ans += chars[start];
        }

        return ans;
    }
}