I am working through the book "The C Programming Language - Second Edition."
This repository just stores some code that I have used to help me learn through this book.
The C Programming Language - Second Edition can be found here
I also took a look at this book too.
"C Programming: A Modern Approach" by K.N.King has useful exercises at the end of the chapter, and seems like a great book, here is a link to its amazon page.