[Haskell-cafe] Solitaire cipher

[Chris Kuklewicz]

There are several problems with the behavior:

> *Main> encrypt ""
> "XXXXX "
> *Main> decrypt $ encrypt ""
> "TANZP XXXXX "

So fixing this case would be the first thing to do, followed by:

> *Main> encrypt "hello"
> "LBVJW XXXXX "
> *Main> decrypt $ encrypt "hello"
> "HELLO YFRTQ XXXXX "