/* FIXME: Does it worth doing a coordinates_t get_coordinates(int y, int x, unsigned type); helper function? */
/* Or a int get_coordinates_x(coordinates_t coordinates); helper function? */
-/* the function do a lot of sanity checks before adding new board elements,
+/* this function do a lot of sanity checks before adding new board elements,
* hence the loop. moving the checks in the main loop is also possible.
* for now, just branch in the main loop given this function error value returned. */
unsigned add_coordinates(coordinates_t new_coordinates, coordinates_t* coordinates_array, unsigned round) {