[monocasa]

That's only the first few hundred lines, whereas the source in the pdf is a few hundred pages.

[epolanski]

Good, you can contribute.

[logicallee]

(Not OP.) You got downvoted, but you motivated me to at least run it through an OCR scanner.

if anyone wants it here you go -

https://github.com/robss2020/OCR-furby-source-code

This is just the PDF run through OCR. I did not manually correct anything, and the results aren't great.