Wordpress - Redirect any page To Single Post Page or any other variable url

functions.php

function redirect_to_single_post(){
    global $wp_query;
    if((is_archive() || is_category()) && $wp_query->post_count == 1){
        // Setup post data
        the_post();
        // Get permalink
        $post_url = get_permalink();
        // Redirect to single post page
        wp_redirect( $post_url );
    }  
 
}
add_action('template_redirect', 'redirect_to_single_post');