Make it increment a number by one

[devallllll]

Would like to have something like

:: Increment the last digit of each number in the path
FOR /L %%i IN (0,1,31) DO (
SET "char=!source:%%i,1!"
IF "!char!" GEQ "0" IF "!char!" LEQ "9" (
SET "num=!num!!char!"
) ELSE (
IF DEFINED num (
SET /A "lastDigit=!num:-1!+1"
SET "num=!num:~0,-1!!lastDigit!"
SET "newPath=!newPath!!num!"
SET "num="
)
SET "newPath=!newPath!!char!"
)
)
IF DEFINED num SET "newPath=!newPath!!num!"

[devallllll]

use the excel and word path setting ps script will do this - the logic could be pulled over easily