HASHMAP_SET
if (strategy == HASHMAP_SET || strategy == HASHMAP_UPDATE) {
hashmap__insert((map), (key), (value), HASHMAP_SET, (old_key), (old_value))
if (strategy == HASHMAP_SET || strategy == HASHMAP_UPDATE) {
hashmap__insert((map), (key), (value), HASHMAP_SET, (old_key), (old_value))
err = hashmap__insert(map, "a", "apple", HASHMAP_SET, &old_key, &old_value);