5.4 Tutorial 7-8

Task 1 Implement at least 2 Functions.
Task 2 Implement at least 2 Predicates.
Task 3 Implement at least 2 Actions.
Task 4 Complete all missing documentation, including pre/postconditions and invariants.
Task 5 Implement List using a DoublyLinkedList and an ArrayList.
Task 6 Write code in class Main to test your implementations.