# Functions
NewATMHandlerConcrete constructor.
NewButton constructor.
NewContainer constructor.
NewPanel constructor.
# Structs
ATMHandlerConcrete struct.
BaseHandler implements the basic handler structure.
Button struct.
ConcreteHandler1 handles request1.
ConcreteHandler2 handles request2.
ConcreteHandler3 handles request3.
Container struct.
Panel struct.
# Interfaces
ATMHandler interface.
Handler defines the interface for handling requests.
Handler interface.