This is a programming kata I designed and used in a Coding Dojo held at University.
The Code
The problem and the base code was programmed by me, and includes step-by-step refactors. It's published in github in this link.
The Coding Dojo
We had a nice Coding Dojo at the Escola Superior de Enxeñería Informática de Ourense.
Here's the announce in my blog: