//2.3.1 add your implementation of the compareTo(...) method

// compare this student to the other student passed based on their names.

// first by last name, then first name if the last name is the same.

// return 0, positive integer, or negative integer values

// 0 if this student's name is the same as the other student's name,

// positive integer if this student's name follows the other student's name in the alphabetical order,

// negative integer if this student's name precedes the other student's name in the alphabetical order.