Remove shortcode

function shortcode_cleaner() {
    remove_shortcode( 'et_pb_blurb' ); // Not exactly required
    add_shortcode( 'et_pb_blurb', 'child_et_pb_blurb' );
}
add_action( 'init', 'shortcode_cleaner' );

function my_remove_shortcode(){
    return '';
}