input: Write a function to check if the first string contains the second string. Return True if the first string contains the second, otherwise return False. If either of the strings is empty, return False.
  assert check_contains("catering", "cat")==True
  assert check_contains("catering", "dog")==False
  assert check_contains("", "cat")==False
  assert check_contains("catering", "")==False
  assert check_contains("string", "ing")==True
output: def check_contains(first, second):
      if not first or not second:
          return False
      return second in first