int largest_line(const int size, int array[][size]) {
    int largest_sum = 0;
    int largest_sum_index = 0;

    for(int index = 0; index < size; index++) {
        int current_sum = 0;
        for(int col = 0; col < size; col++) {
            current_sum+=array[index][col];
        }
        if(current_sum > largest_sum) {
            largest_sum = current_sum;
            largest_sum_index = index;
        }
    }
    return largest_sum_index;
}