Symfony convert city name

Symfony, Twig, Bootstrap;

by Zsanett Tamás

HTML

<! -- offices page  -->
<div class="col-12 col-md-6">
  <div class="card text-left" id="szeged">
    <div class="card-header pb-0">
      <h5>Csongrád megye</h5>
    </div>
    <div class="card-body">
      <h5 class="card-title">Szeged</h5>
      <p class="office-type">(központ)</p>
      <p class="card-text pt-3"><img src="{{ asset('assets/img/offices/geotag2.png') }}" alt="Geo ikon kép" class="pr-2 geo-icon">6772 Szeged, Vitéz u.20.</p>
      <div class="row">
        <div class="col-8 offset-2">
          <a href="{{ path('data_sheet_index',{'city':'szeged'}) }}" class="text-center btn btn-outline-light pl-5 pr-5">Tovább az adatlapodra!</a>
        </div>
      </div>
    </div>
  </div>
</div>




<! -- data sheet page -->
<div class="container p-4">
  <h2><span class="text-capitalize">{{ city }}</span> (központ)</h2>
  <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Phasellus hendrerit. Pellentesque aliquet nibh nec urna. In nisi neque, aliquet vel,<br> dapibus id, mattis vel, nisi. Sed pretium, ligula sollicitudin laoreet viverra, tortor libero sodales
    leo, eget blandit nunc tortor eu nibh. Nullam<br> mollis. Ut justo. Suspendisse potenti.</p>
</div>

<?php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;

class OfficeController extends AbstractController
{

    /**
     * @Route("/irodaink", name="office_index")
     */
    public function OfficeIndexAction()
    {
        return $this->render('office/index.html.twig');
    }
    /**
     * @Route("/irodaink/adatlap/{city}", name="data_sheet_index")
     */
    public function DataSheetIndexAction($city)
    {
        return $this->render('office/data-sheet.html.twig',[ 'city' =>  $this->getCityName($city)]);
    }

    /**
     * convert city name
     *
     * @param $city string
     * @return string
     */
    protected function getCityName($city) {
        if ($city == null) {
           ...