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_1 ) {
    StringBuffer var_2 = new StringBuffer ( ) ;
    while ( ! var_1 . isEmpty ( ) && ( var_1 . peek ( ) instanceof String ) ) {
      var_2 . insert ( 0 , var_1 . pop ( ) ) ;
    }
    return var_2 . toString ( ) ;
  }
  