input: Write a function to return True if the given string contains the word "Hello", otherwise return False. If the string is empty, return False.
  def check_hello(s):
      return 'Hello' in s
  assert check_hello("Hello, how are you?")==True
  assert check_hello("Hi, this is a test")==False
  assert check_hello("")==False
  assert check_hello("Say Hello to everyone")==True
  assert check_hello("There's no hello here")==False
output: def check_hello(s):
      return 'Hello' in s