But I became disinterested because:

1. Most beginning programmers don't start with C

2. I wouldn't get a chance to go deep and explore the language.

So I shelved it, unfinished.

Flash forward to about a year ago... I had flash of inspiration: change the audience to intermediate programmers.

Now I could skim the general conceptual stuff and get into more details.

One thing, though. C actually added a lot of stuff in the intervening years. I didn't realize the magnitude of the project.

Oh well! Too late to turn back now!