Form Submit in Laravel Results to 404

I installed Laravel then copied index.php from public to root and changes some lines in index.php. I also copied htaccess. Now I tried creating a route like so below

I tried using and but to no avail

<form action="" method="POST">

            <div>Email: <input type="text" name="username" class="userName textboxes push-right-33"></div>

            <div>Password: <input type="password" name="password" class="password textboxes"></div></br>

            <div class="fpassword-section">
                <a href="#" onclick="return false;" class="forgot-password">Forgot Password</a>
            </div>

            <div class="links">
                <input type="submit" class="button button-signin signin" value="Sign In">
            </div>
        </form>

and my route will be

Route::post('/signin', 'LoginContoller@authenticateUser');

and my controller be like

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
use Illuminate\Support\Facades\Hash;

class LoginContoller extends Controller
{
    public function index(){

        return view('pages.login');

    }

    public function authenticateUser(Request $var){
        echo "string";
    }
}

Authenticate user does not return anything instead of 404

via Chebli Mohamed