input: Write a function to determine if the given string contains the word "Hello". If it contains "Hello", return True, otherwise return False. If the given string is empty or contains only spaces, return False.
  assert check_hello("Hello, world!")==True
  assert check_hello("hello there")==False
  assert check_hello("Hi there, Hello everyone!")==True
  assert check_hello("     ")==False
  assert check_hello("")==False
output: def check_hello(s):
      return "Hello" in s and s.strip() != ""