Robot

Please have Zamir Syed review this.  
I took down the origin
`r_name` is not a great name, guessing you did it for line length purposes?

Also, you have arrays, so you can probably compress: `(('A'..'Z').to_a.sample(2) + (0..9).to_a.sample(3)).join("")`. Either way, though, this is doing too much work in a constructor. Move this to a named method and avoid the trouble.