format code style

acme.sh

@@ -6365,9 +6365,10 @@ _checkSudo() {
     case "$SUDO_COMMAND" in
       */su)
         #it's a normal user doing `sudo su`, no problem
-        return 0 ;;
+        return 0
+        ;;
     esac
-    for i in `cat /etc/shells`; do
+    for i in $(cat /etc/shells); do
       if [ "$SUDO_COMMAND" = "$i" ]; then
         #it's a normal user running `sudo -i` or `sudo -s`, fine
         return 0