add slash to end of url htaccess

I have url http://localhost/sw-trainit/index.php http://localhost/sw-trainit/tutorial.php http://localhost/sw-trainit/detail.php?page=html&url=how-to-create-table-using-html

how can my url become http://localhost/sw-trainit/ http://localhost/sw-trainit/tutorial/ http://localhost/sw-trainit/html/how-to-create-table-using-html/