This capitalize method doesn't bash hyphenated names

capitalize_with_hyphens

#!/usr/local/bin/ruby -wKU

class String
  def capitalize_with_hyphens!
      if self.include? "-"
        pieces_array = self.split("-")
        pieces_array.each { |e| e.capitalize! }
        joined = pieces_array.join("-")
        replace(joined)
      else
        raise "Must contain at least one hyphen"
      end
  end
end

hyp_name = "zeta-jones"

puts hyp_name.capitalize_with_hyphens!