How do I stop an object from cloning when moving?

I'm creating a mobile game that the user has to tap the screen to move the object/character. Right now I'm using mouse input to test the game play and haven't gotten far in development, just getting the input down but I can't seem to figure it out. When I press play then click on the screen, the object moves to the clicked position but leaves a trail of self clones and it continues to do it every time I click. Help is greatly appreciated.

 public class PlayerInput : MonoBehaviour 
 {
     private Vector3 target;
     public float speed = 1.5f;
 
         // Use this for initialization
     void Start () 
     {
         target = transform.position;
     
     }
     
     // Update is called once per frame
     void Update () 
     {
         if (Input.GetMouseButtonDown(0))
         {
 
             target = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             target.z = transform.position.z;
 
             //Debug.Log("TAP!!!");
         }
 
         gameObject.transform.position = Vector3.MoveTowards(transform.position, target, speed * Time.deltaTime);
 
     }
 }