I'm trying to write a sponge-based cryptographic hash function in C code. The sponge has a 32-bytes capacity, rate 16 bytes, an input with 10*1 padding, and a specifiable number of output bytes. It must include the below functions. It reads mbytes from m and writes the rbytes bytes result to res.

void hash(unsigned char m[], unsigned mbytes, unsigned char res[], unsigned rbytes)

Unfortunately, this is all of the information I have on the assignment. It would be really helpful if you can leave comments (//) next to the line of codes explaining what they are doing.