method_original_name_demo.rb

class Human
  attr_accessor :first_name, :last_name
  
  def initialize(first_name, last_name)
    @first_name = first_name
    @last_name = last_name
  end
  
  def full_name
    "#{first_name} #{last_name}"
  end
  
  alias_method :user_name, :full_name
end