input: Write a function to check if the given string contains the word "Hello". If it does, return True; otherwise, return False. The function should return True if the given string is empty.
  def check_hello(s):
      return 'Hello' in s
  assert check_hello("Hello world")==True
  assert check_hello("This is a test")==False
  assert check_hello("Another day, another Hello")==True
  assert check_hello("")==True
output: def check_hello(s):
      return 'Hello' in s