How to make global function and get the data returned in Laravel 5

I just read this post to make a global function which is able to be accessed from any controller. But I don't understand how it works.

I want to make variable 'services' accessible from any controller. So, I make General.php and put it in app/Http. Here is the code.

<?php
class General {

   public function getServices() {
      $services = "SELECT * FROM products";
      return $services;
   }
}

And in the controller I include it

<?php
namespace App\Http\Controllers;

use App\Http\General;
use Illuminate\Http\Request;

class HomeController extends Controller {
   public function index() {

       $title = 'Our services';
       $services = General::getServices();

       return view('welcome',  compact('title','services'));

   }
}

When I run it I got error Class 'App\Http\General' not found. And then how I can Anyone can help would be appreciated.

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