You're working on a secret team solving coded transmissions.
Your team is scrambling to decipher a recent message, worried it's a plot to break into a major European National Cake Vault. The message has been mostly deciphered, but all the words are backward! Your colleagues have handed off the last step to you.
Write a method reverse_words() that takes a message as a string and reverses the order of the words in place.
For example:
message = "cake pound steal"
reverse_words(message)
puts message
# prints: "steal pound cake"
When writing your method, assume the message contains only letters and spaces, and all words are separated by one space.