Write a Java program 'HW1.java' and implement two functions. Test those functions in your main function to see if they would work with all valid inputs. 1. Implement a function score2letterGrade() as described in comments below. (10 points) static String score2letterGrade (double max, double score) { // Return "A" if score is 90% and above of the max // Return "B" for 80%