void nextPosition () {
    int cx = humans[targetId]->x - x;
    int cy = humans[targetId]->y - y;
    int dist2 = distance2(*humans[targetId]);
    // If the distance is less or equal to zombie speed then nextX takes the value of human X and nextY takes the value of human Y
    if (dist2 < ZOMBIE_SPEED_SQUARED) {
        x = humans[targetId]->x;
        y = humans[targetId]->y;
    }
    else {
        float distanceCoeff = ZOMBIE_SPEED / distance(dist2);
        x += cx * distanceCoeff;
        y += cy * distanceCoeff;
    }
}