input: Write a function to check if the first string contains the second string. If the first string contains the second, return True; otherwise, return False. If either string is empty, return False.
  assert check_contains("catering", "cat")==True
  assert check_contains("apple", "pie")==False
  assert check_contains("banana", "nano")==True
  assert check_contains("orange", "juice")==False
  assert check_contains("", "")==False
  assert check_contains("hello", "")==False
output: def check_contains(s1, s2):
      if not s1 or not s2:
          return False
      return s2 in s1