hack_sanitation_app.rb

      tags     = parse_hashtags body
      [200, {}, tags.join(' ')]
    else
      404  # What happened? Not Twilio, apparently
    end
  end


  private

  # Looks for all the command words in the message
  def parse_commands com, body
    # Accumulate our command dictionary
    dict = com.report + com.clean + com.follow + com.stop
    # Get the words from the body
    words = body.downcase.split(/\W+/)
    
    words & dict
  end

  # Looks for hashtags like #bang! ==> ['bang!']
  def parse_hashtags body
    body.downcase.split(/\W+/).delete_if do |w|
      not (w[0,1] == "#")