Error CS1519 new to coding cant figure out this error

Unity Engine
1

I cant seem to figure out the solution to this error.
the code is getting a collision message and is telling another game object to go from disabled to active but i cant figure out why this error is occurring.
thank you in advanced for your assistance.

this is the error given by console
Assets/scrips/stopper.cs(16,8): error CS1519: Unexpected symbol `private’ in class, struct, or interface member declaration

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;



public class stopper : MonoBehaviour

{
    public GameObject stopper
    private bool finnished = false;
 
    void update ()
    {
        if(finnished)
            return;
        stopper.SetActive (false);
    }
    public void Finnish()
    {
        finnished = true;

        stopper.SetActive (true);

    }
}
2

You’re missing a semicolon after:
public GameObject stopper.