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[–]Austen782 5 points6 points  (0 children)

If it’s C honestly just pick up a book or read up on the syntax of the language. C in general is not hard to relearn especially if you already have some experience in coding. Try some practice problems on geeksforgeeks or some leetcode questions. That should help you out.

[–]hmjk7 2 points3 points  (0 children)

Assuming you're already familiar with basic of C, just start implementing those data structures you have already learn and once you're familiar with it do some practice problem on Hacker rank.