stack

type Stack interface {
	// Push pushes an element onto the top of this Stack.
	Push(element interface{})

	// Pop removes and returns the top element of this Stack.
	Pop() interface{}

	// Peek returns the top element of this Stack without removing it.
	Peek() interface{}

	// Clear removes all elements from this Stack.
	Clear()

	// Size returns the amount of elements in this Stack.
	Size() int

	// IsEmpty checks if this Stack is empty.
	IsEmpty() bool
}