input: Write a python function to create a dictionary from a list where each key has an empty list as its value.
  assert make_dict_from_list(['a', 'b', 'c']) == {'a': [], 'b': [], 'c': []}
  assert make_dict_from_list([1, 2, 3]) == {1: [], 2: [], 3: []}
  assert make_dict_from_list([]) == {}
output: def make_dict_from_list(lst):
      return {key: [] for key in lst}