Having strange problem changing Boolean in Laravel

So having this strange problem in laravel. I am trying to update a boolean value in my database but i keep getting this strange error in my log:

Missing required parameter for [Route: change.stock] [URI: product/stock/{product}/{turn}] [Missing parameter: turn]

Anybody maybe knows what i am over seeing here.

My route:

Route::get('/product/stock/{product}/{turn}', [ProductController::class, 'changeStock'])->name('change.stock');


My Controller:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Gate;
use App\Http\Requests\Product\{ImageRequest,OfferRequest,DeliveryRequest,InformationsRequest};
use App\Models\{Product,Image,Offer,Delivery,Category,Favorite};
use Illuminate\Support\Str;

class ProductController extends Controller
{
/**
* Change product stock setting
*
* @param $turn
* @return \Illuminate\Http\RedirectResponse
*
*/
public function changeStock($turn): \Illuminate\Http\RedirectResponse
{
try{
$this -> setStock($turn);
session() -> flash('success', 'You have changed your product stock setting');
}
catch (RequestException $e){
session() -> flash('errormessage', $e -> getMessage());
}
return redirect() -> back();

}


My User.php Model:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Laravel\Sanctum\HasApiTokens;
use Carbon\Carbon;
use App\Traits\UUIDs;
use App\Models\Conversation;

class User extends Authenticatable
{
use HasApiTokens, HasFactory, Notifiable, UUIDs;

/**
* Sets the product stock status
*
* @param $turn
* @throws RequestException
*/
public function setStock($turn)
{
// sets stock value
$this -> in_stock = $turn == 0;
$this -> save();

}



The blade file:

<div class="btn-group btn-group-sm w-100 my-1 mb-4" role="group" aria-label="Basic example">
<a href="{{ route('change.stock', 1) }}" class="btn @if
($product -> in_stock == 1)
btn-success btn-sm @else btn-outline-success btn-sm @endif">In Stock</a>
<a href="{{ route('change.stock', 0) }}" class="btn @if
($product -> in_stock == 0)
btn-danger btn-sm @else btn-outline-danger btn-sm @endif">Set Out of Stock</a>
</div>

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