Windows 10: REN command is not working

I have written a simple batch file to rename all of the files with a same file extension inside a folder with consecutive number starting with one provided by the user. It works correctly when I use it with files named like "[We-now] Do It - 783 [spa]".****, but when I try to use it in another folder with .mkv files, with file names like this "Now or Never - 130- Bryan's Return! Into Hell for Nairobi's fault! [1080p][x264][AAC][Eng-Sub]-df68.mkv" the command says it is not able to find the file. Same happens if I just try to run the REN command from a cmd

Here is my code:


setlocal enabledelayedexpansion



REM //Setting working directory as current folder



SET "wp=."



REM // Asking user for extension to rename

SET /P ext="Extension of files to rename: "



REM // Asking user for the first number

SET /P fn="Introduce first number: "

SET /A i=%fn%

SET /A k=1

REM // We start renaming

FOR %%J IN "%wp%\*.%ext%" DO CALL :rnaming "%%J"

goto End






:Rnaming

SET aux=%~nf1

ECHO %aux%

ECHO Iteration %k% - Next name: %i%

ECHO Renaming %~1

ren "%aux%" "%i%.%ext%"

SET /A i=%i%+1

SET /A k=%k%+1



:End


Thanks in advance for any help!

:)

 

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