Not update categories table in Laravel 5.6?

working with Laravel 5.6 and MySQL. I am going to update categoryname and image in my categories table using the following controller function?

public function update(Request $request, $id)
{

    if ($request->isMethod('get'))
        return view('categories.form', ['image' => Category::find($id)]);

    else {
        $rules = [
            'categoryname' => 'required',
        ];
        $this->validate($request, $rules);
        $image = Category::find($id);
        if ($request->hasFile('image')) {
            $dir = 'images/';
            if ($image->image != '' && File::exists($dir . $image->image))
                File::delete($dir . $image->image);
            $extension = strtolower($request->file('image')->getClientOriginalExtension());
            $fileName = str_random() . '.' . $extension;
            $request->file('image')->move($dir, $fileName);
            $image->categoryimage = $fileName;
        } elseif ($request->remove == 1 && File::exists('images/' . $image->image)) {
            File::delete('images/' . $image->post_image);
            $image->categoryimage = null;
        }
    }
    $image->categoryname = $request->categoryname;
    $image->save();
    return redirect()->route('categories.index');
}

and route

Route::match(['get', 'put'], 'category/update/{id}', 'CategoryController@update');

and edit form

@if(isset($image))
        <form method="PUT" action="http://localhost:8000/category/update/" enctype="multipart/form-data">

        <input type="hidden" name="_method" value="put">

<label for="description" class="col-form-label col-md-3 col-lg-2">Description</label>
                <div class="col-md-8">
                    <input class="form-control" autofocus placeholder="Description" name="categoryname" type="text" id="categoryname" value="">



 <label for="image" class="col-form-label col-md-3">Image</label>
                    <div class="col-md-5">
                        <img id="preview"
                             src=""
                             height="200px" width="200px"/>
                        <input class="form-control" style="display:none" name="image" type="file" id="image" name="_token" value="">
                        <br/>
                        <a href="javascript:changeProfile();">Add Image</a> |
                        <a style="color: red" href="javascript:removeImage()">Remove</a>
                        <input type="hidden" style="display: none" value="0" name="remove" id="remove">

but when I try to update data it is not updating. only refresh to the same page. no, any error

url look like this http://localhost:8000/category/update/21?categoryname=tractorrer&image=&remove=0 //tractorrer is updated category name

how can fix this problem?

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