gistfile1.rb

  def bit
    "%0160b" % to_i(16)
  end

  def distance(word1, word2)
    word1, word2 = word1.bit, word2.bit
    distance = 0
    word1.chars.zip(word2.chars) do |char1, char2|
      puts "#{char1} | #{char2}"
      distance += 1 unless char1 == char2
    end
    return distance
  end

word1 = Digest::SHA1.hexdigest("challenge")
word2 = Digest::SHA1.hexdigest("entry")

distance(word1,word2)