C# Error while trying to set up shot damage and headshots

So basically ive been trying to create a first person shooter with unity 3d, all was going well until i thought i should add headshots, ive been trying to add it for a while and i cant find a answer to the error im getting.

the error is:

Assets/Scripts/Weapon/gundmg.cs(10,1): error CS1525: Unexpected symbol `void'

what im trying to do is make it detect when the shot hits a certain collider it does more damage. Ive done this by tagging each object a certain tag and using RayCast to do the damage.

Here is my script:

 using UnityEngine;
 using System.Collections;
 
 public class gundmg : MonoBehaviour {
     int DamageAmount = 30;
     float TargetDistance;
     float AllowedRange = 100;
 }
 
 void Update () {
     if(Input.GetButtonDown("Fire1")) {
         RaycastHit Shot;
         if (Physics.Raycast (transform.position, transform.TransformDirection(Vector3.forward), Shot)) {
             TargetDistance = Shot.distance;
             if (TargetDistance < AllowedRange) {
                 if (Physics.Raycast (_transform.position, _transform.forward, out hit, distance) && hit.transform.gameObject.tag == ("Enemy")) {
                     if (hit.collider.tag =="Headshot")
                     {
                         DamageAmount = 100;
                         Shot.transform.SendMessage("DeductPoints", DamageAmount);
                     }
                 }
             }
         }
     }
 }