KevinJSis spot on as usual. And you really don't need to do either of those item thankfully. But.....
Should you actually ever feel inclined to defrag, there is a way to do it. Use iTunes to do a full backup and then tell it to do a full restore. Depending on how much data, apps, music, photos and books you have it can take anywhere from 30 to 90+ minutes to complete the restore process. During the restore process all the data is written first and then apps, music, books and photos if memory serves. But I have only done this once and it was simply to test a theory because I am odd like that.