typedd.rb

class Printer
  def self.full_name(person)
    "Your name is: #{person.fname} #{person.lname}"
  end
end

class Person
  attr_reader :fname, :lname

  def initialize(fname, lname)
    @fname = fname
    @lname = lname
    raise "Firstname too short" if fname.empty?
  end
end

john = Person.new("", "Doe")
puts Printer.full_name(john)