instructors when creating a new course department, they should use this format

com/nd/16/17/000xxx



important todo
books should not be deleted
a book can be hidden / hibernated, but never deleted
reason being that a book once sold, is tied to the customers and the proceeds therein

implement soft deletes or better still take off the possibility to delete a book from the app interface.

department service needs to be created


instead of deleting a book, a book should be toggled active or inactive.