Homemade plugin while using Themify Ultra

I am using the theme called Themify Ultra for a webproject. Theme can be found here.

I want to make a plugin that changed letters to other letters like leetspeak. Here is the code in my plugin that is located in the plugin folder.


    Plugin name: information
    Description: Lägga till den nödvändiga informationen


        function info_change_content($content){

            $content = str_ireplace("s", "5", $content);
            $content = str_ireplace("l", "1"

    , $content);
        $content = str_ireplace("t", "7", $content);
        $content = str_ireplace("o", "0", $content);
        $content = str_ireplace("ck", "XX", $content);

        return $content;


        add_filter("the_content", "info_change_content");

I have activated the plugin but it wont change the letters. Has this something with the theme to do? Can’t I do this while using this theme?

Thanks for the help!

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