navmeshAI block collisions for two cloned Enemy Objects

I have a problem about enemies. I want to block collision between enemies. So i have to put distance for cloned object but i couldn't do it. can you help me for this?



My code is below:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.AI;
5.  
6. public class zombie_ai : MonoBehaviour {
7.  
8.     public float distance;
9.     public AudioClip[] moaning;
10.     public float sec = 3;
11.  
12.     private Transform player;
13.     private PlayerHealth playerHealth;
14.     private EnemyHealth enemyHealth;
15.     private ZombieAttack attack;
16.     private NavMeshAgent nav;
17.     private Animator anim;
18.     private float timer;
19.     private float sum;
20.  
21.     bool play = true;
22.  
23.     AudioSource moanAudio;
24.  
25.     void Start () {
26.         moanAudio = GetComponent<AudioSource> ();
27.         player = GameObject.FindGameObjectWithTag("Player").transform;
28.         enemyHealth = GetComponentInChildren<EnemyHealth> ();
29.         playerHealth = player.GetComponent<PlayerHealth> ();
30.         anim = GetComponent<Animator> ();
31.         nav = GetComponent<NavMeshAgent> ();
32.     }
33.    
34.     // Update is called once per frame
35.     void Update () {
36.         if (play) {
37.             StartCoroutine ("Sound");
38.         }
39.         if (enemyHealth.currentHealth > 0 && playerHealth.currentHealth > 0) {
40.             nav.SetDestination (player.position);
41.         } else {
42.             nav.enabled = false;
43.             anim.SetTrigger ("Eating");
44.         }
45.  
46.         if (Vector3.Distance (player.position, transform.position) <= distance) {
47.             Debug.Log ("Attacking");  
48.             anim.SetTrigger ("Attack");
49.         }
50.         else {
51.             anim.Play ("Zombie_Walk");
52.         }
53.  
54.     }
55.  
56.     IEnumerator Sound()
57.     {
58.         play = false;
59.         sum += sec;
60.         int i = Random.Range(0, moaning.Length);
61.         Debug.Log ("caldi");
62.         AudioSource.PlayClipAtPoint(moaning[i], transform.position);
63.         yield return new WaitForSeconds (sec);
64.         play = true;
65.     }
66.  
67. }
68.  

 

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