Powershell Organise files - Match file Name - Make folder and Organise

Hello friends, 

I am trying to organise all the files in a big folder, now it has a lot of files that need to be organized.


I got the idea from here for a powershell script to help my poor hands.

#http://stackoverflow.com/questions/6477612/organizing-files-by-type

The script will look for files that have a keyword in the file name

Example if file  name contains  Apple or House   move to the folder  "home"

 { $_.FileName -match '(Car|House)'} { "home" }

Now I have got stuck for hours and hours :(    and well i need your great help please




=============================
function get-destbytype($FileName)
{
    switch ($FileName)
    {
        { $_.FileName -match '(jpg|gif)'} { "images" }

         { $_.FileName -match '(Car |House)'} { "home" }
        
    
       
        default {"$FileName" }
    }
}

$Oldfolder = "C:\Users\PW\Desktop\a\"

$org = "$nas\Users\PW\Desktop\b"            

ls $Oldfolder/* | ? {!$_.PSIsContainer} | %{

  $dest = "$($org)\$(get-destbytype $_.FileName)"
 
 
  if (! (Test-Path -path $dest ) )
  {
    write-host "creating $dest"
    new-item $dest -type directory
  }
  mv -path $_ -destination $dest
}
===========================

The script only copies the files as is to the destination folder.

It does not create the folders :(

please help

thank you very much for your expert guidance

pw