Challenge: Implementing a Generic Class

You can clone the base code from the GithHub Repository.

A stack is a special kind of data structure which stores data according to the Last In, First Out (LIFO) principle. A stack has two main methods, namely, Push and Pop. The Push adds a new element to the stack, and Pop removes the most recently added element from the stack. You can imagine it like a stack of books, or any other item. By using Push you add a new item on the top, and by using Pop you remove the item at the top. This is the LIFO principle.

The program contains a class which implements the Stack data structure, however, it only supports integers. Make changes in the class code so that it is able to support any data type.