input: Write a function to combine two dictionaries of similar structure together, such that the entries in the two dictionaries are merged into a single dictionary. If there are overlapping keys, the value from the second dictionary should overwrite the value from the first dictionary in the merged dictionary.
  def merge_dict(dict_a, dict_b):
      merged_dict = {**dict_a, **dict_b}
      return merged_dict
  assert merge_dict({'a':1, 'b':2, 'c':3}, {'d':4, 'e':5, 'f':6}) == {'a':1, 'b':2, 'c':3, 'd':4, 'e':5, 'f':6}
  assert merge_dict({'a':1, 'b':2}, {'a':4, 'b':5}) == {'a':4, 'b':5}
  assert merge_dict({}, {'d':4, 'e':5}) == {'d':4, 'e':5}
  assert merge_dict({'a':1, 'b':2}, {}) == {'a':1, 'b':2}
  assert merge_dict({}, {}) == {}
output: def merge_dict(dict_a, dict_b):
      merged_dict = {**dict_a, **dict_b}
      return merged_dict