I'm in a similar situation as the parent comment, wanting to re-learn C after more than a decade (or two). Thanks for the link to a recent discussion! For the parent, here are some of the recommended books:

Head First C - Griffiths and Griffiths

Expert C Programming: Deep C Secrets - Peter van der Linden

Modern C - Jens Gustedt

C Programming: A Modern Approach - K. N. King

21st Century C: C Tips from the New School - Ben Klemens

Understanding and Using C Pointers - Richard Reese

C Interfaces and Implementations: Techniques for Creating Reusable Software - David R. Hanson

The Standard C Library - P. J. Plauger