input: Write a function to determine if the first string contains the second string. If the first string contains the second string, return True. Otherwise, return False.
  def check_contains(query, word):
      if query.find(word) != -1:
          return True 
      return False
  assert check_contains("catering", "cat")==True
  assert check_contains("catering", "dog")==False
  assert check_contains("python", "on")==True
  assert check_contains("", "cat")==False
  assert check_contains("catering", "")==True
output: def check_contains(query, word):
      if query.find(word) != -1:
          return True 
      return False