Initialize Everything

Implement int sum_known(const int *a, size_t n) that totals the array — and if n is 0 returns 0. The trap: a wrong answer pattern is returning an uninitialized accumulator 'sometimes works'. Then implement int *find_or_null(int *a, size_t n, int v) returning the first match or NULL — the two functions together exercise init-discipline and null contracts.