Routing to the the first child of a page

Kirby 2 Questions 🤔
1

How can I use routing to redirect when a link with the url www.example.com/projects to the first child of the projects page www.example.com/projects/first-child?

2 
c::set('routes', array(
  array(
    'pattern' => 'projects',
    'action'  => function() {
       $firstChild = page('projects')->children()->visible()->first();
       if($firstChild) {
         go($firstChild->uri());
       } else {
         return page('projects');
       }
    }
  )
));