[Toybox] [toybox] fold implementation

[Samuel Holland]

Hello, everyone.

Here is a basic implementation of fold[0]. It does not support multibyte characters, though that would probably just require more switch cases. This is my first contribution, so please comment your thoughts/what I can improve.

I was planning to write an "unfold" utility that basically did the opposite. Although I don't think it's in any standard, would it still be of any interest?

[0] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/fold.html

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Regards,
Samuel Holland <samuel at sholland.net>