best and safe way of sending filename in url using CI 2.2 and smarty

[eluser]mstdmstd[/eluser]
Hi,
which is the best and safe way of sending filename in url using CI 2.2 and smarty ?
I tried to make it like

Code:

< a href="admin/admin/view_source{"/application/views/Bootstrap-3-Admin-Theme/admin/header.tpl"|urlencode}" > header source< / a >

but I got error

Code:

"Not Found" http://local-ci22.com/admin/admin/view_source/application/views/Bootstrap-3-Admin-Theme/admin/header.tpl"

In my config :

Code:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';