Little example of refactoring a small part of an application.
Use this as a example, as exercise or to test someones skills

In newDev0 sthe task is located, newDev1 contains a refactored version, newDev2 has more refactored version,
that also can handle different output format, here HTML and TEXT.

The task is a small billing task, that create a bill for customers basket, that contains articles.
If a defined amount of articles is reached (here 20) a discount is given, depending on articles margin group.

The goal is to output the bill text.

The classes:
article  - represents a article, it's name, margin type and price
selling  - represents a article and it's count in basket
customer - assign an customer (by name) to a selling and can deliver the bill text