# File lib/quiz1/t/solutions/Niklas Frykholm/solitaire.rb, line 92
  def sanitize(s)
    s = s.upcase
    s = s.gsub(/[^A-Z]/, "")
    s = s + "X" * ((5 - s.size % 5) % 5)
    out = ""
    (s.size / 5).times {|i| out << s[i*5,5] << " "}
    return out
  end