Complete the Course class by implementing the DropStudent() member function, which removes a student (by last name) from the course roster. If the student is not found in the course roster, no student should be dropped. Given classes:

Class Course represents a course, which contains a vector of Student objects as a course roster. (Type your code in here.)
Class Student represents a classroom student, which has three private data members: first name, last name, and GPA. (Hint: getLast() returns the last name field.)
Note: For testing purposes, different student values will be used.

Ex. For the following students: