input: Write a python function to compute the similarity score between two strings based on common and unique words.
  assert get_similarity_score("The quick brown fox jumps over the lazy dog", "The fast yellow rabbit jumps on top of the tired lion") == 0.2222222222222222
  assert get_similarity_score("hello world", "hello") == 0.5
  assert get_similarity_score("apple orange banana", "banana orange grape") == 0.5
output: def get_similarity_score(str1, str2):
      set1 = set(str1.split())
      set2 = set(str2.split())
      
      common_words = set1.intersection(set2)
      unique_words = set1.union(set2)
      
      score = len(common_words) / len(unique_words)
      
      return score