input: Write a python function to convert a list to a dictionary where the keys are the indices of the list elements.
  assert convert_list_to_dict([1, 2, 3, 4, 5, 6]) == {0: 1, 1: 2, 2: 3, 3: 4, 4: 5, 5: 6}
  assert convert_list_to_dict(['a', 'b', 'c']) == {0: 'a', 1: 'b', 2: 'c'}
  assert convert_list_to_dict([]) == {}
output: def convert_list_to_dict(lst):
      return {i: lst[i] for i in range(len(lst))}