Power set GFG khatarnak

 package com.company;

public class CWR_powerSet_Gfg {

//    power set
    public static void getPowerSet(String s){
        int str = s.length();
        int a = (int) Math.pow(2,s.length());

        for(int i = 0; i < a; i++){
          for(int j = 0; j < str; j++){
              if((i & (1<<j)) != 0) System.out.print(s.charAt(j));
          }
            System.out.println(" ");
        }

    }
    public static void main(String[] args) {
getPowerSet("123");
    }
}