add superclass Ringmaster.
make save method include class Student by moving method to superclass Ringmaster.
add test for managing new objects if they are the same.
move another_instance method into superclass Ringmaster.
add method for showing all students or all teacher.
add method for deleting teachers from database.
add method for deleting students from the database.:
add method for teachers to update their apparatus.
add method for listing all student assigned to a teacher.
add method for listing all teachers for whom the student is assigned.
add welcome method to UI
call welcome method on UI, so it will run.
add database information to the UI