GL1TCH3D's Extension Tool

@echo off
setlocal enabledelayedexpansion
title GL1TCH3D's Extension Tool

set num=0

:ext0

Echo What extension would you like to add (do not include the .)?

set /p ext%num%=-^>

call :check1

:ext

Echo What extension would you like to remove (do not include the .)?

set /p ext%num%=-^>

if /i not "%check%"=="none" set /a num-=1 &goto none

call :check1

cls

Echo Add extensions to files with no extensions? (Y/N)

set /p check=-^>

if /i not "%check%"=="N" goto none

:replace
cls
Echo Replacing the following extensions with %ext0%:

For /l %%a in (1,1,%num%) do (
if "!ext%%a!"=="" echo empty &goto pause
echo !ext%%a!
)

:pause
echo Press any key to continue

pause > nul
CLS
set cur=1
set dot=.

:restart
if "!ext%cur%!"=="" set dot=
for /f "tokens=1,2 delims=." %%g in ('dir /b /a:-d "!cd!"') do (
if "%%h"=="!ext%cur%!" rename %%g!dot!%%h %%g.!ext0!
if "%%h"=="!ext%cur%!" echo %%g!dot!%%h to %%g.!ext0!>>log.log
)
if "%cur%"=="%num%" goto finish

set /a cur+=1

goto restart

:finish
cls
echo Files successfully renamed!
echo Press any key to close the program.
pause>nul
exit

:check1

for /l %%a in (1,1,10000) do (
set inp1=!ext%num%:~%%a,1!
if "!inp1!"=="." goto error
if not defined inp1 goto end
)
:end

:check2
echo Is "!ext%num%!" correct? (Y/N)

set /p check=-^>

if /i not "%check%"=="Y" goto No
if %num%==0 set /a num+=1 &exit /b

cls
:check3
Echo Would you like to replace more extensions? (Y/N)

set /p check=-^>

if /i not %check%==N set /a num+=1 & goto ext

exit /b

:error

Echo Please do not add the "."
Echo Press any key to try again &
Pause > nul
if %num%==0 goto ext0
goto ext

:No
CLS
if %num%==0 goto ext0
goto ext

:none
set none=Yes
set /a num+=1
set ext%num%=
goto replace