input: Write a function that returns True if the given string contains the word "Hello", otherwise returns False. If the given string is empty, return False.
  assert check_hello("Hello, world")==True
  assert check_hello("Hey there, how are you?")==False
  assert check_hello("Hey there, Hello!")==True
  assert check_hello("Goodbye")==False
  assert check_hello("")==False
output: def check_hello(s):
      return "Hello" in s if s else False