Userguide CI 3.0 error

So, are you suggesting that $news_item['slug'] itself contains 'news/'?

No. There is a list of news on 'http://example.com/index.php/news/'. Each new has its own URL relatively created. Because the URL is created relatively due to 'http://example.com/index.php/news/', then another 'news/' should not be there.

<p><a href="news/<?php echo $news_item['slug'] ?>">View article</a></p>

It acts like following, which creates wrong URL's and leading to 404 error message:
'http://example.com/index.php/news/' + 'news/' + $news_item['slug'] = 'http://example.com/index.php/news/news/slug'

It should acts like this:
'http://example.com/index.php/news/' + $news_item['slug'] = 'http://example.com/index.php/news/slug'

Routing:

PHP Code:

$route['news/create'] = 'news/create';
$route['news/(:any)'] = 'news/view/$1';
$route['news'] = 'news';
$route['(:any)'] = 'pages/view/$1';
$route['default_controller'] = 'pages/view';