Click to move + CharacterControler problem

I have a problem with this script, when i click ,the Gameobject only go to 1 direction and not stop , please i need help

 public class moveclick : MonoBehaviour {
 private Transform myTransform;                // this transform
     private Vector3 destinationPosition;        // The destination Point
     private float destinationDistance;            // The distance between myTransform and destinationPosition
      Vector3 targetPoint;
     public float moveSpeed;                        // The Speed the character will move
  
  
     void Start () {
         myTransform = transform;                            // sets myTransform to this GameObject.transform
         destinationPosition = myTransform.position;            // prevents myTransform reset
         animation.Play("Idle");
     }
  
     void Update () {
  
         // keep track of the distance between this gameObject and destinationPosition
         destinationDistance = Vector3.Distance(destinationPosition, myTransform.position);
  
         if(destinationDistance < .5f){        // To prevent shakin behavior when near destination
             moveSpeed = 0;
             animation.Play("Idle");
         }
         else if(destinationDistance > .5f){            // To Reset Speed to default
             moveSpeed = 3;
              animation.Play("Run");
         }
  
  
         // Moves the Player if the Left Mouse Button was clicked
         if (Input.GetMouseButtonDown(0)&& GUIUtility.hotControl ==0) {
  
             Plane playerPlane = new Plane(Vector3.up, myTransform.position);
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             float hitdist = 0.0f;
 
             if (playerPlane.Raycast(ray, out hitdist)) {
                 Vector3 targetPoint = ray.GetPoint(hitdist);
                 destinationPosition = ray.GetPoint(hitdist);
                 Quaternion targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
                 myTransform.rotation = targetRotation;
             }
         }
  
         // Moves the player if the mouse button is hold down
         else if (Input.GetMouseButton(0)&& GUIUtility.hotControl ==0) {
  
             Plane playerPlane = new Plane(Vector3.up, myTransform.position);
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             float hitdist = 0.0f;
  
             if (playerPlane.Raycast(ray, out hitdist)) {
                 Vector3 targetPoint = ray.GetPoint(hitdist);
                 destinationPosition = ray.GetPoint(hitdist);
                 Quaternion targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
                 myTransform.rotation = targetRotation;
             }
         //myTransform.position = Vector3.MoveTowards(myTransform.position, destinationPosition, moveSpeed * Time.deltaTime);
         }
  
         // To prevent code from running if not needed
         if(destinationDistance > .5f){
             //myTransform.position = Vector3.MoveTowards(myTransform.position, destinationPosition, moveSpeed * Time.deltaTime);
          this.GetComponent<CharacterController>().SimpleMove(myTransform.position);
         }
         
         if(!this.GetComponent<CharacterController>().isGrounded) this.GetComponent<CharacterController>().SimpleMove (new Vector3(0, -0.3f, 0));
     }
 }