Little update

[mfgbhatti]

Hey, updated script to use only case statement instead of case + if statement introduce a single function that's taking a target url, wgetting it saving it to temp.jpg. then there is a type check update which if mime is ok copy this temp.jpg to wallpaper.jpg I also done some rearranging of script which is just for readability purposes not effecting any of functionality. i think i covered everything in this PR but certainly will be very happy to help. regards