input: Write a python function to compare the similarity between two strings using fuzzywuzzy's fuzz.ratio and return the similarity score.
  assert compare_strings('Apple', 'Apples') == 100
  assert compare_strings('Apple', 'Orange') < 50
  assert compare_strings('Hello', 'Hello World') > 50
output: from fuzzywuzzy import fuzz
  
  def compare_strings(str1, str2):
      return fuzz.ratio(str1, str2)