total_dy = (int64_t)total_dy * (100 - config.return_speed) / 100;
total_dx += engine->dx_result;
total_dy += engine->dy_result;
total_dy = (int64_t)total_dy * (100 - config.return_speed) / 100;
total_dx += engine->dx_result;
total_dy += engine->dy_result;