The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Fitbit or ex-Fitbit Embedded Software Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews

A pointer to dest so that memcpy could be used as an argument in another function.