I need help. I don't know where to post this :/ topic

I am making a big programme to unpack or repack boot image. I made a batch file but its giving error when I enter my choice
Batch code is removed: but no problem in it

Code:::::

color 02

cls
@ECHO off

:start

cls

echo ================================================

echo == TOOL MADE BY MZ_. ==

echo == Credits: Me for creating tool ==

echo ================================================

echo.

echo.

echo.

echo 1) Extract Boot IMAGE

echo.

echo 2) Repack Boot IMAGE

echo.

echo 3) View on XDA

echo.

echo 4) End program

echo.

set /p ch=Enter a choice in numbers:

if no '%ch%'==set ch=%ch%:~0,1%

if '%ch%'=='1' goto extract

if '%ch%'=='2' goto repack

if '%ch%'=='3' goto xda

if '%ch%'=='4' goto end

echo Please chose a valid option, '%ch%' isn't valid!

echo.

pause

goto start

:extract
@ECHO TOOL MADE BY HAMZA
@ECHO www.facebook.com/MZ11200
@ECHO muhammad.hamza514@yahoo.com
@ECHO _____________________________________

goto start



:repack
@ECHO Deleted code...
goto start



:xda

start http://forum.xda-developers.com/andr...6/post59543250

goto start



:end

end


Hit THANKS if I help, or you like my post!

xda-developers