change ruby version

@ECHO OFF
echo 1 - Ruby 2.3
echo 2 - Ruby 2.4
echo 3 - Ruby 2.5
choice /C 123 /M "Which Ruby? "

if errorlevel 3 goto ruby25-x64
if errorlevel 2 goto ruby24-x64
if errorlevel 1 goto ruby23-x64
goto confused

:ruby23-x64
IF EXIST C:\DEVKIT\NUL RMDIR C:\DEVKIT
IF EXIST C:\RUBY\NUL RMDIR C:\RUBY
MKLINK /J C:\RUBY C:\RUBY23-X64
MKLINK /J C:\DEVKIT C:\DEVKIT64
GOTO ENDE

:ruby24-x64
IF EXIST C:\DEVKIT\NUL RMDIR C:\DEVKIT
IF EXIST C:\RUBY\NUL RMDIR C:\RUBY
MKLINK /J C:\RUBY C:\RUBY24-X64
goto ende

:ruby25-x64
IF EXIST C:\DEVKIT\NUL RMDIR C:\DEVKIT
IF EXIST C:\RUBY\NUL RMDIR C:\RUBY
MKLINK /J C:\RUBY C:\RUBY25-X64
goto ende

:confused
echo I'm confused ...
exit

:ende
ruby -e "print 'Ruby version: ', RUBY_VERSION"