input: Write a function that takes two lists as input and returns a dictionary where the elements of the first list are the keys and the elements of the second list are the values. If the lengths of the two lists are not equal, return an empty dictionary.
  
  assert create_dict(['a', 'b', 'c'], [1, 2, 3])=={'a': 1, 'b': 2, 'c': 3}
  assert create_dict(['a', 'b'], [1, 2, 3])=={}
  assert create_dict([], [])=={}
output: def create_dict(keys, values):
      if len(keys) != len(values):
          return {}
      return dict(zip(keys, values))