solid-1-srp-correct.rb

class Invoice
  attr_accessor :product_name

  # default name
  def name
    "Invoice for #{@product_name}"
  end
end

class InvoiceEmail < Invoice
  def send
    puts "Emailing an invoice..."
    puts name
  end
  
  def name
    "Any other, specific formatting of a name #{@product_name}"
  end
end

class InvoicePresenter < Invoice
  def short_name
    puts name
  end
end