comefrom: <awangdev>Decode String_1.java
code: private String popStack(Stack<Object> stack) {
  
          StringBuffer sb = new StringBuffer();
          while (!stack.isEmpty() && (stack.peek() instanceof String)) {
              sb.insert(0, stack.pop());
          }
          return sb.toString();
      }
masked: private String var_0 ( Stack < Object > var_3 ) {
    StringBuffer var_5 = new StringBuffer ( ) ;
    while ( ! var_3 . isEmpty ( ) && ( var_3 . peek ( ) instanceof String ) ) {
      var_5 . insert ( 0 , var_3 . pop ( ) ) ;
    }
    return var_5 . toString ( ) ;
  }
  