Неработающее условие «if "%1"==""» в bat-файле

@echo off
if "%1"=="" (
:WriteAgain
set x= 
set /p variables=Write your expression 
if "%variables%"=="help" (
echo Use arithmetical operations and numbers without spaces. + for sum, * for multiplication, / for 
 
devision, - for subtraction 
exit
)
set variables=%variables: =%
set /a x=%Variables% 2>Error.txt
if %errorlevel% neq 0 goto ErrorOccured
echo %x% 
pause
exit
:ErrorOccured
echo Your expression is not valid 
goto WriteAgain
) else (
set variables=%*
set variables=%variables: =%
set /a x=%variables% 2>Error.txt
if %errorlevel% neq 0 goto ErrorOccured
echo %x%
)

@echo off
 
if "%~1"=="" (goto 1) else (goto 2)
 
:1
 set expression=
 set /p "expression=Write your expression: "
 call :operation "%expression%"
 if %errorlevel% neq 0 (
  call :error
  echo.
  goto 1
 )
 echo.
 exit /b
 
:2
 if "%~1" equ "help" (
  call :%~1
  exit /b
 )
 call :operation %*
 if %errorlevel% neq 0 (
  call :error
  exit /b
 )
 echo.
 exit /b
 
:operation
 cmd /c set /a %* 2>nul
 goto :eof
 
:error
 echo Your expression is not valid.
 goto :eof
 
:help
 echo Use arithmetical operators and numbers with or without spaces.
 echo + for sum, * for multiplication, / for devision, - for subtraction.
 goto :eof