refactor: move add tunnel to function

install.sh

@@ -25,6 +25,7 @@ else
     [ -f /etc/config/dhcp-opkg ] && cp /etc/config/dhcp /etc/config/dhcp-old && mv /etc/config/dhcp-opkg /etc/config/dhcp
 fi
 
+add_tunnel() {
     echo "What type of VPN or proxy will be used?"
     echo "1) VLESS, Shadowsocks (A sing-box will be installed)"
     echo "2) Wireguard"
@@ -93,6 +94,9 @@ while true; do
             ;;
         esac
     done
+}
+
+add_tunnel
 
 echo "Installed podkop..."
 opkg install $DOWNLOAD_DIR/podkop*.ipk