Target class [User] does not exist. - Laravel

I am learning laravel. I tried many times but I didn't find what's the issue in my User controller.Please go through the code and help me out.

Illuminate\Contracts\Container\BindingResolutionException Target class [User] does not exist.

web.php file

<?php
use Illuminate\Support\Facades\Route;
                
                
Route::get('/', function () {
    return view('welcome');
    //return redirect('sample');
});

// Route::get('sample/{id}',function($id){
//     echo $id;
//     return view('sample');
// });

// Route::view('sample','sample');
// Route::redirect('youtube','sample');

Route::get('users','User@index');
Route::get('show','User@show');
        

This is my controller

 <?php
    
    namespace App\Http\Controllers;
    
    use Illuminate\Http\Request;
    
    class User extends Controller
    {
        //
        function index()
        {
            return ['name' => 'Abhishek'];
        }
        function show()
        {
            echo "Hello controller";
        }
    }

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class User extends Controller
{
    //
    function index()
    {
        return ['name' => 'Abhishek'];
    }
    function show()
    {
        echo "Hello controller";
    }
}
         
     


 

via Chebli Mohamed