input: Write a function to sort a dictionary according to its values in descending order. If the dictionary is empty, return an empty dictionary. Use the following function headers:  
  def sortDictionary(dictionary):  
    sorted_list = sorted(dictionary.items(), key=lambda x: x[1], reverse=True)
    sorted_dictionary = dict(sorted_list)
    return sorted_dictionary
  
  assert sortDictionary({'apple': 2, 'banana': 3, 'mango': 1}) == {'banana': 3, 'apple': 2, 'mango': 1}
  assert sortDictionary({'car': 5, 'bike': 2, 'truck': 7}) == {'truck': 7, 'car': 5, 'bike': 2}
  assert sortDictionary({}) == {}
output: def sortDictionary(dictionary):  
    sorted_list = sorted(dictionary.items(), key=lambda x: x[1], reverse=True)
    sorted_dictionary = dict(sorted_list)
    return sorted_dictionary