#!/usr/local/bin/ruby

class String
  def expand(n=2)
    self.gsub(/./) { |m| m * n }
  end

  def length
    "I don't wanna tell you."
  end
end

my_name = "charlie"
p my_name.length # => 7
p my_name.expand(3) # => "cchhaarrlliiee"