Here is an approch, just give a try :
@echo off
Title How to assign the SSID of current connected wifi network to a variable in a batch script
for /f "delims=: tokens=2" %%n in (
'netsh wlan show interface name="Wi-Fi" ^| find /i "PROFIL"'
) do set "Network=%%n"
Call :Trim "%Network%" Connected_SSID
echo The Current SSID Connected is : "%Connected_SSID%"
echo Did you want to disconnect from this SSID "%Connected_SSID%" ?
pause
cls & echo( & color 0C
netsh wlan disconnect
TimeOut /T 5 /NoBreak>nul
cls & echo( & color 0A
echo Did you want to re-connect to this SSID : "%Connected_SSID%" ?
pause
netsh wlan connect name="%Connected_SSID%"
Pause & Exit
::---------------------------------------------------------------------------
:Trim <String>
(
echo Wscript.echo Trim("%~1"^)
)>"%tmp%\%~n0.vbs"
@for /f "delims=" %%a in ('Cscript /nologo "%tmp%\%~n0.vbs"') do set "%2=%%a"
exit /b
::---------------------------------------------------------------------------
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