Stuff

   public String toString() {
      if (this.left == null && this.right == null){
         String thesymb = String.valueOf(this.symbol);
         return thesymb;
      }
      if (this.left != null || this.right != null){
         out.printf (this.left + "" + this.symbol + this.right);
      }
   return "pancakes";
   }