// Add following methods :- // .push // Should add an element at the end. // .pop() // Should remove an element from the end. // .top() // Should return the element at the last index. // .print() // Should print the elements in a single line (e.g. [1,2,3,4]). // .printReverse() // Should print the elements in a single line in reverse order. // .size // Should return the length of the stack