public GameObject[] wayPoints;
public int walkStep=-1;
public float speed;

void Walking()
{
       if(Vector3.Distance(transform.position,wayPoints[walkStep].transform.position)<speed)
       {
             transform.LookAt(wayPoints[walkStep]);
       } else {
             walkStep++;
             if(walkStep>wayPoints.Length-1)
                   walkStep=0; // OR WTF??
       }
}