@echo off

rem For each file in your folder

for %%a in (".\*") do (

rem check if the file has an extension and if it is not our script

if "%%~xa" NEQ ""  if "%%~dpxa" NEQ "%~dpx0" (

rem check if extension folder exists, if not it is created

if not exist "%%~xa" mkdir "%%~xa"

rem Move the file to directory

move "%%a" "%%~dpa%%~xa\"

))