Milestones Milestone 1: Parse the input 1. Make a StackCalculator class that has a method process input that takes in a String. 2. Using the Project Driver I provided and instead of solving each expression, print out the inputted values, one per line. For example: Input: 2 + 14 Output: 2 14 (Hint: String Tokenizer can be very helpful here) Milestone 2: Set up the Stack and Queue for your project so that the Shunting Yard Algorithm works on simple expressions. Specifically your calculator should be able to solve expressions in Validity Test 1 of the Project Driver Final Project The final code should be able to solve every expression in the provided Driver class and should have been tested on other expressions as well, as the driver class I use to test your projects, while similar will be different from the provided Driver