Please put the code below in a .bat file and save it to your folder with files and run it.
@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 "%%~dpnxa" NEQ "%~dpnx0" (
rem check if extension forlder exists, if not it is created
if not exist "%%~xa" mkdir "%%~xa"
rem Copy (or change to move) the file to directory
copy "%%a" "%%~dpa%%~xa\"
)
)