public function createPost(Request $request, Response $response)
{
$title = $request->getParam('title');
$content = $request->getParam('content');
$slug = trim($title);
$slug = str_replace(' ', '-', $slug);
$post = new Post();
$post->setTitle($title);
$post->setContent($content);
$post->setSlug($slug);
$this->em->persist($post);
$this->em->flush();
echo "Da them bai viet moi thanh cong";
}