Excerpts provide an alternative to the use of the <!–more–> quicktag.

There is a control over more tag for a post author, in which you can manually set the more tag position inside post.

But using excerpts requires, and allows, template writers to explicitly choose whether to display full posts.

By default, excerpt more string at the end is set to ‘[…]’. The […] is added by the_excerpt(). There is a filter supplied called the excerpt_more filter that is specifically included to customize the read more text after the excerpt. 

If you want to hide the excerpt […] without changing the theme template then you have to change in the function.php file. To change excerpt more string using excerpt_more filter, add the following code to functions.php file in your theme:

function new_excerpt_more( $more ) {
return ' ';
}
add_filter('excerpt_more', 'new_excerpt_more');