codeigniter 3.1.9 with apache and php 7.2 - routing/redirect issues with sym link

You do not show a routing rule for "test1" on its own. That means that it would be resolved by either "application/controllers/test1/Home.php" or by "application/controllers/Home:test1()".

You don't need a route for "home". If "home" is the default controller, when www.example.com would be resolved as "application/controllers/Home:index()".