Fatal error: Call to undefined function base_url() in C:\wamp\www\Test-CI\application\views\layout.php on line 5

You have to load the url helper to access that function.
Either you add

$this->load->helper('url');

somewhere in your controller.

Alternately, to have it be loaded automatically everywhere, make sure the line in application/config/autoload.php that looks like

$autoload['helper'] = array('url');

has 'url' in that array (as shown above).