I need to rotate a Cube with the touch finger. This is the code, but does not work. How can i fix that?

  var touch : Touch;
     if (Input.touchCount > 0) {
         if (Input.GetTouch(0).phase == TouchPhase.Moved){
             var primarytouch : Touch = Input.GetTouch(0);
             var speed = primarytouch.deltaPosition/primarytouch.deltaTime;
             }
             
          if (Input.GetTouch(0).phase == TouchPhase.Ended){
         var finishedtouch : Touch = Input.GetTouch(0);
         var ray : Ray = Camera.main.ScreenPointToRay(finishedtouch.position);
         
         var controller : CharacterController = GetComponent(CharacterController);
         var hit : RaycastHit;
         var moveDirection : Vector3 = Vector3.zero;
        
         if (Physics.Raycast(ray,hit,100))
         {
         var startPos = transform.position;
         var targetPoint = hit.point;
         var targetRotation = Quaternion.LookRotation(targetPoint - transform.position, Vector3.up);
         transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, Time.time *2.0);   
         transform.position = Vector3.Lerp(startPos, hit.point, Time.time * 1);
         
         }   
 }
 }