Objective To practice object-oriented programming through classes, objects and methods. To practice using various kinds of loops. Assignment Create a wrapper class for StringBuilder called MyStringBuilder that provides a method indexof that takes a char as a parameter and returns the index of the first occurrence and a method toUpperCase that changes all the characters to upper case. Write a simple program to test your class. It does not need to take input from the user, but needs to test your class thoroughly. This is called a "test harness". Implementation Your class should have a single instance variable of class StringBuilder (this is not the best way to do this, but it's the best you know so far). You can use Character.toUpperCase from java.util to convert an individual character to upper case