This is better for preventing memory fragmentation and may also be a
little faster. Some methods were extracted, library calls avoided,
and the code cleaned up.

I hereby disclaim any implicit or explicit ownership of my changes in this
changeset, and put them under a multiple licence consisting of your choice of
one of more of:

• The CC0 / Public Domain - https://creativecommons.org/choose/zero/ .

• The MIT / Expat license - https://en.wikipedia.org/wiki/MIT_License

• Any licence in the 2018-Aug-27 popular licenses list of

https://opensource.org/licenses

Crediting me will be nice, but not mandatory, and you can change the licence
of the project without needing my permission.

build and run the test suite and check that the tests pass and then try playing freecell or Simple Simon.