Fix format

deploy/cdn_ali.sh

@@ -103,9 +103,8 @@ _ali_urlencode() {
   _str="$1"
   _str_length="${#1}"
   i=1
-  while [ "$i" -le "$_str_length" ]
-  do
-    _str_c="$(expr substr "$_str" "$i" 1)"
+  while [ "$i" -le "$_str_length" ]; do
+    _str_c="$(printf "%s" "$_str" | head -c "$i" | tail -c 1)"
     case $_str_c in
       [a-zA-Z0-9.~_-]) printf "%s" "$_str_c" ;;
       "") printf "%s" "%0A" ;;