input: Write a python function to add, remove, and print items from a list using the ItemList class.
  assert item_list.add("apple") == None
  assert item_list.add("banana") == None
  assert item_list.remove("apple") == None
  assert item_list.items == ["banana"]
  item_list.print_all_items()
output: class ItemList:
      def __init__(self):
          self.items = []
  
      def add(self, item):
          self.items.append(item)
  
      def remove(self, item):
          if item in self.items:
              self.items.remove(item)
  
      def print_all_items(self):
          for item in self.items:
              print(item)