acronymize.rb

def acronymize(string)
  string.split(" ").map { |word| word[0].upcase }.join
end

encrypt.rb

def encrypt(text)
  alphabet = ('A'..'Z').to_a
  new_string = ""
  text.chars.each do |letter|
    if alphabet.include?(letter)
      letter_index = alphabet.index(letter)
      new_string += alphabet[letter_index - 3]
    else
      new_string += letter
    end
  end
  new_string
end


puts encrypt("THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG") == "QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD"