input: Write a function called item_counts that takes a dictionary as an argument and returns the count of each item in the dictionary.
  assert item_counts({"apples": 5, "oranges": 6, "bananas": 7})=={"apples": 5, "oranges": 6, "bananas": 7}
  assert item_counts({"apples": 2, "oranges": 1})=={"apples": 2, "oranges": 1}
  assert item_counts({})=={}
output: def item_counts(d):
      return d