reverse.rb

def reverse_alternate(string)
  # 1. Break the string down into an array of words.
  # 2. Loop over each word in the array.
  #     - if the index is odd, change the word so it is reversed.
  #     - if the index is even, leave it as it is.
  # 3. Join all the words in the array together so they are a string again, with spaces between them.
  # 4. Return the new string we made.
end

reverse_alternate('one two three four') #=> 'one owt three ruof'