I use a hash table as the main data structure for a project in C. I use this implementation of SipHash as the hash function. I use chained lists to handle collisions. The index for a given element to be inserted or searched in the hash table is computed as follows:

I’m new to C programming and I’m trying to understand the differences between two programs that check for duplicate elements in an array using hash tables with the uthash library. I’ve noticed some differences in their implementation, and I’m not sure if the changes in Program 1 are indeed improvements over Program 2. Could you help me understand these differences and their implications?