Moving coordinate conditional problem

IEnumerator Start () { while (true) { ob = Charac.transform.position.x; obb = Charac.transform.position.z;

         if (Charac.transform.position.x < ob) {
             transform.position = new Vector3 (Random.Range (Charac.transform.position.x - 50, Charac.transform.position.x - 100), Charac.transform.position.y - 10, 
                 Random.Range (Charac.transform.position.z + 25, Charac.transform.position.z - 25));
             Instantiate (pt, transform.position, transform.rotation);
         } else if (Charac.transform.position.x > ob) {
             transform.position = new Vector3 (Random.Range (Charac.transform.position.x + 50, Charac.transform.position.x + 100), Charac.transform.position.y - 10, 
                 Random.Range (Charac.transform.position.z + 25, Charac.transform.position.z - 25));
             Instantiate (pt, transform.position, transform.rotation);
         } else if (Charac.transform.position.z > obb) {
             transform.position = new Vector3 (Random.Range (Charac.transform.position.x + 25, Charac.transform.position.x - 25), Charac.transform.position.y - 10, 
                 Random.Range (Charac.transform.position.z + 50, Charac.transform.position.z + 100));
             Instantiate (pt, transform.position, transform.rotation);
         } else if (Charac.transform.position.z < obb) {
             transform.position = new Vector3 (Random.Range (Charac.transform.position.x + 25, Charac.transform.position.x - 25), Charac.transform.position.y - 10, 
                 Random.Range (Charac.transform.position.z - 50, Charac.transform.position.z - 100));
             Instantiate (pt, transform.position, transform.rotation);
         }

         yield return new WaitForSeconds (interval);
     }

We want the object to run according to the condition that the coordinates move when the character coordinates move. However, the object does not run properly. I do not know the problem. Plz ...