Rename

@echo off
if exist "1" goto start
if not exist "1" goto end
:start
if not exist %cd%\2 (ren "1" "2" & goto end)

if exist %cd%\2 (set /a folder=3 & goto rename)

:rename

if not exist %cd%\%folder% (ren "1" %folder% & goto end)

if exist %cd%\%folder% goto rename2
:rename2
set /a folder=%folder%+1
goto rename

:end
mkdir "1"