create_string function

@echo off

set string=%2
set /a takeaway=5

for /f "usebackq tokens=*" %%a in ('%string%') do (

    if %string% equ %%~a (
        set /a takeaway=3
    )

    set string=%%~a
)

echo %2 > %TEMP%\tempfile.txt

for %%g in ( %TEMP%\tempfile.txt ) do (
    set /a %1_lenght=%%~zg - %takeaway%
)
del %TEMP%\tempfile.txt
set %1=%string%