BIG TITLE valid and columns

Hello. I see you validate the BIG TITLE, in the new version.
I’m not expert but I guess you insert this code in the shortcodes.php file, to fix the error:
//Remove <p>s altogether
$content = str_replace(“<p>”, “”, $content);
$content = str_replace(“</p>”, “”, $content);
I would like to validate the columns also, so I tried to use the same rows of code (in shortcodes.php file, just few rows below) but it does not work…
Have you any advice, please?