input: Write a python function to sort a dictionary by its keys.
  assert sort_dictionary_by_keys({"c": 3, "a": 1, "b": 2}) == {"a": 1, "b": 2, "c": 3}
  assert sort_dictionary_by_keys({"z": 26, "y": 25, "x": 24}) == {"x": 24, "y": 25, "z": 26}
  assert sort_dictionary_by_keys({"apple": 5, "banana": 3, "cherry": 7}) == {"apple": 5, "banana": 3, "cherry": 7}
output: def sort_dictionary_by_keys(d):
      return dict(sorted(d.items()))