main is already complete: it reads a count n, then n more integers one at a time, calling add_to(&total, amount) for each. Your job is just add_to – it’s called repeatedly against the same total variable in
main, and each call needs to add to whatever’s already there, not reset it.
This is the same out-parameter pattern as the first exercise, but used across multiple calls instead of one –
total in main persists across the whole loop, while each call to add_to only sees it for an instant through
the pointer. If your first test passes but later ones look like only the last amount “stuck,” that’s a sign
you’re overwriting *total instead of adding to it.