input: Write a function to determine if the first string contains the second string. If it does, return True; otherwise, return False.
  assert check_contains("catering", "cat")==True
  assert check_contains("hello", "world")==False
  assert check_contains("programming", "gram")==True
  assert check_contains("python", "on")==True
  assert check_contains("jump", "ump")==True
output: def check_contains(s1, s2):
      return s2 in s1