Can't Add Read More link to Excerpts

Hi,
My theme includes this in functions.php:

# Removes tags and trailing dots from excerpt
function dp_clean($excerpt, $substr=0) {
$string = strip_tags(str_replace(‘[…]’, ‘…’, $excerpt));
if ($substr>0) {
$string = substr($string, 0, $substr);
}
return $string;

I don’t understand this code, but it leaves this on my webpage in my excerpts as my read more:

[…] (with no link)

I don’t want that, I just want a read more link. I’ve tried removing the above code from my functions.php and replacing it with what codex is telling me to use on this page:
http://codex.wordpress.org/Customizing_the_Read_More

but nothing is working. Do I have to leave this code there and add something else? Do I have to modify this code in order for it to show a link? Someone help. Not sure even what this code means like I said. Thanks a lot.