I just finished the C Piscine at a 42 school, so I have gotten a good grasp of the basics of C (about 300 hours worth). The school won't start until October, and I'd like to practice my C skills in the meantime so I can be better prepared when it does start.
Any suggestions for curriculum / projects that don't start at the very beginning? I already have a good grasp of pointers, control structures, structs, string manipulation, etc.
I'd suggest starting a project and make a git repository for it, then start a thread here where you post your changes and questions. I'm sure you'll get a lot of feedback on your code and have your questions answered. This group need some acitivity anyway.
Write a basic game, like a text strategy game in ncurses or a roguelike. Add ability to save and load games, design it so the computer can play the game itself and the player can drop in or out at any time.
Read good code like musl libc. Redis and modern BSD are also said to be good.