input: Write a function to return True if the given string contains the word "Hello", otherwise return False. If the given string is empty, return False.
  assert check_hello("Hello, world!")==True
  assert check_hello("Hi there!")==False
  assert check_hello("hello, world!")==False
  assert check_hello("HelloHello")==True
  assert check_hello("")==False
output: def check_hello(s):
      return "Hello" in s if s else False