4chan number sorting

// list      - list of integers
// size      - size of the list
// target   - number to put at the end
void move_to_back(int *list, size_t size, int target) {
    unsigned int counter = 0;
    unsigned int index = 0;
    int solved_list[size];

    // Create a new list without the target number
    for (int i = 0; i < size; i++) {
        if (list[i] == target) {
            counter++;
        } else {
            solved_list[index++] = list[i];
        }
    }

    // Append the appropriate number of targets to the end
    for (int i = index; i < size; i++) {
        solved_list[i] = target;
    }

    // Copy solved_list to list (Do I need a free() here?)
    memcpy(list, solved_list, sizeof(solved_list));
}


int main() {
    int list[9] = {1,9,7,4,9,3,2,6,9};
    move_to_back(list, 9, 9);
}