I need Help with the bergzerg arcade Melee combat scripts

I'm using the bergzerg arcade enemy attack/player health script for my game, Iv'e applied the targets and everything but my health won't go down, here's my enemy attack script.

  public GameObject target;
   public float attackTimer;
   public float coolDown;
   public int damage;
     // Use this for initialization
     void Start () {
       attackTimer = 0;
       coolDown = 2.0f;
     }
     
     // Update is called once per frame
     void Update () {
       if (attackTimer > 0){
         attackTimer -= Time.deltaTime;
         }
         if(attackTimer < 0){
           attackTimer = 0;
           }
         if(attackTimer == 0){
         Attack();
         attackTimer = coolDown;
         }        
     
     }
     private void Attack(){
     float distance = Vector3.Distance(target.transform.position, transform.position);
     
     Vector3 dir = (target.transform.position - transform.position).normalized;
     
     float direction = Vector3.Dot(dir, transform.forward);
     
     if(distance < 5.5f){
       if(direction > 0){
         PlayerHealth eh = (PlayerHealth)target.GetComponent("PlayerHealth");
         eh.AddjustCurrentHealth(damage);
       }
     }
     }
 }
 

and here's my player health script

 using UnityEngine;
 using System.Collections;
 
 public class PlayerHealth : MonoBehaviour {
 public int maxHealth = 100;
 public int curHealth = 100;
 
 public float healthBarLength;
 
 // Use this for initialization
 void Start () {
 healthBarLength = Screen.width / 2;
 }
 
 // Update is called once per frame
 void Update () {
 AddjustCurrentHealth (0);
 }
 void OnGUI(){
 GUI.Box(new Rect(10, 10, healthBarLength, 20), curHealth + "/" + maxHealth);
 }
 
 public void AddjustCurrentHealth(int adj) {
 curHealth += adj;
 
 if(curHealth < 0)
 curHealth = 0;
 
 if (curHealth > maxHealth)
 maxHealth = 1;
 
 healthBarLength = (Screen.width / 2) * (curHealth / (float)maxHealth);
 }
 }
 

could you tell me what's wrong or give me two alternative scripts (if so, it can be in Java script or C#)