remove […] &hellip wordpress from excerpt

The #wordpress concatenating […] in #the_excerpt and sometimes with [&hellip]; I here function defined as trim_excerpt and it passed in add_filter you can copy and put the following code in functions.php file of your current active theme.

function trim_excerpt($text){
    return rtrim(str_replace('[&hellip', '', $text), '[...]');
}
add_filter('get_the_excerpt', 'trim_excerpt');

little bit information about add_filter function

#add_filter can change modify of the data, you can customize everything which is showing from #wordpress core functions.