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:: Parameters are names of variables that you do NOT want to be cleared.
::
:: call :emptyVarEnviornment var1 var2
::
:: var1 and var2 will be preserved
::---------------------------------------------------------------------------------------
:emptyVarEnviornment
    set "preserve= preserve path %~1 "
    for /f "delims==" %%v in ('set') do if "!preserve: %%v =!" equ "!preserve!" set "%%v="
    set "preserve="
goto :eof
::---------------------------------------------------------------------------------------