Remove the extra 'Quiz' on the single quiz page

functions.php

add_filter( 'sensei_single_title', 'sensei_dl_custom_double_quiz_remove' );

function sensei_dl_custom_double_quiz_remove( $title ){

    if(  'quiz' == get_post_type()
        && 1 < substr_count( strtoupper( $title ), 'QUIZ' ) ){

        // remove all possible appearances of quiz
        $title_with_no_quizzes = str_replace( 'quiz', '', $title  );
        $title_with_no_quizzes = str_replace( 'Quiz', '', $title_with_no_quizzes  );
        $title_with_no_quizzes = str_replace( 'Quiz', '', $title_with_no_quizzes  );

        return $title_with_no_quizzes  . __( 'Quiz', 'woothemes-sensei');

    }

    return $title;

}