How to remove index.php?route= from all links in OpenCart?

Practice

/* How do I remove index.php?route= from all links in OpenCart?
in the file /catalog/controller/common/seo_url.php
make the following changes (highlighted in bold)
*/
class ControllerCommonSeoUrl extends Controller
{


     //****
    {

        if (isset($this->request->get['product_id']))
        {
            $this->request->get['route'] = 'product/product';
        } elseif (isset($this->request->get['path']))
        {
            $this->request->get['route'] = 'product/category';
        } elseif (isset($this->request->get['manufacturer_id']))
        {
            $this->request->get['route'] = 'product/manufacturer/info';
        } elseif (isset($this->request->get['information_id']))
        {
            $this->request->get['route'] = 'information/information';
        } else
        {
            $this->request->get['route'] = $this->request->get['_route_'];
        }

        if (isset($this->request->get['route']))
        {
            return $this->forward($this->request->get['route']);
        }
    }

    public function rewrite($link)
    {
        if ($this->config->get('config_seo_url'))
        {
            $url_data = parse_url(str_replace('&', '&', $link));
            $url = '';

            $data = array();

            parse_str($url_data['query'], $data);
            foreach ($data as $key => $value)
            {

                if (isset($data['route']))
                {
                    if (($data['route'] == 'product/product' && $key == 'product_id') || (($data['route'] ==
                        'product/manufacturer/info' || $data['route'] == 'product/product') && $key ==
                        'manufacturer_id') || ($data['route'] == 'information/information' && $key ==
                        'information_id'))
                    {
                        $query = $this->db->query('SELECT * FROM ' . DB_PREFIX .
                            'url_alias WHERE `query` = ' . $this->db->escape($key . '=' . (int)$value));

                        if ($query->num_rows)
                        {
                            $url .= '/' . $query->row['keyword'];

                            unset($data[$key]);
                        }
                    } elseif ($key == 'path')
                    {
                        $categories = explode('_', $value);

                        foreach ($categories as $category)
                        {
                            $query = $this->db->query('SELECT * FROM ' . DB_PREFIX .
                                'url_alias WHERE `query` = 'category_id=' . (int)$category . ');

                            if ($query->num_rows)
                            {
                                $url .= '/' . $query->row['keyword'];
                            }
                        }

                        unset($data[$key]);
                    } else
                    {
                        $query = $this->db->query('SELECT * FROM ' . DB_PREFIX .
                            'url_alias WHERE `query` = '' . $this->db->escape($data['route']) . ');

                        if ($query->num_rows)
                        {
                            $url .= '/' . $query->row['keyword'];

                            unset($data[$key]);
                        }
                    }


                }
            }

            $link = str_replace('index.php?route=', '', $link);


            if ($url)
            {
                unset($data['route']);

                $query = '';

                if ($data)
                {
                    foreach ($data as $key => $value)
                    {
                        $query .= '&' . $key . '=' . $value;
                    }

                    if ($query)
                    {
                        $query = '?' . trim($query, '&');
                    }
                }

                return $url_data['scheme'] . '://' . $url_data['host'] . (isset($url_data['port']) ?
                    ':' . $url_data['port'] : '') . str_replace('/index.php', '', $url_data['path']) .
                    $url . $query;
            } else
            {
                return $link;
            }
        } else
        {
            return $link;
        }
    }

   //****

 }