mkdir processed
for i in * ; do
 unrar e $i
  if [ -f *.mkv ] ; then
   if [ "$i.mkv" != $(ls *.mkv) ] ; then
    mv *.mkv $i.mkv
   fi
   mv *.mkv processed
  fi
  if [ -f *.avi ] ; then
   if [ "$i.avi" != $(ls *.avi) ] ; then
    mv *.avi $i.avi
   fi
   mv *.avi processed
  fi
done
mv processed/* .
rmdir processed