def slurp_remaining_bird_tracks(lines)
      tracked_lines = []

      while lines.first =~ BIRD_TRACKS_REGEX
        tracked_lines << remove_bird_tracks(lines.shift)
      end

      if tracked_lines.empty?
        ""
      else
        "\n" + tracked_lines.join("\n")
      end
    end
def slurp_remaining_bird_tracks(lines)
      tracked_lines = []

      while lines.first =~ BIRD_TRACKS_REGEX
        tracked_lines << remove_bird_tracks(lines.shift)
      end

      if tracked_lines.empty?
        ""
      else
        "\n" + tracked_lines.join("\n")
      end
    end
Given an Array of lines, pulls from the front of the Array
 until the next line doesn't match our bird tracks regex.

   lines = ["> code", "> code", "", "not code"]
   slurp_remaining_bird_tracks(lines)
   # => "code\ncode"

 Returns the lines mashed into a string separated by a newline.