GetComponent C#

How can I fix this script, I am getting this error, "error CS1525: Unexpected symbol 'playerHealth' "

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System;
 using System.Text;
 
 
 public class SmartAi : MonoBehaviour 
 {
     public Transform target;
     public Transform projectile;
     public Transform myTransform;
     public GameObject player;
     int moveSpeed = 5;
     bool attacking = true; 
     int ammo = 100;
     int close = 5;
     
 
 
     // Use this for initialization
     void Start () 
     {
 
     }
     
     // Update is called once per frame
     void Update () 
     {
         transform.LookAt(target);
         move();
         healthPoints();
         if(attacking == true)
         {
             //if(Vector3.Distance(transform.position, target.position) < close)
             //{
                 shoot();
             //}
         }
         
     }
     
     void shoot ()
     {
         var playerHealth = playerHealth
         playerHealth = target.GetComponent("playerHealth");
         playerHealth.health = playerHealth.health - 10; 
         
     }
     void move ()
     {
         myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
     }
     void healthPoints ()
     {
         int hitPoints = 100;
         if(hitPoints <= 0)
         {
             Destroy(gameObject);
         }
         if(hitPoints >= 100)
         {
             hitPoints = 100;
         }
     }
 }