https://www.linkedin.com/learning/c-code-challenges

 
All programmers must keep their coding muscles toned, which requires regular challenges and review of best practices. Beginners desire realistic exercises to continue their education, and experienced coders must constantly brush up on the basics as well as those areas of C that programmers often have issues with, such as pointers, recursion, and systems programming. In this course, Dan Gookin provides challenges for coders across the C knowledge spectrum with regular exercises to keep their programming skills fresh and ready for their next opportunity.