This is the Powershell forum. Your code is only partly Powershell. I recommend to use pure Powershell syntax and not to use aliasses. On top of that you should format your code as code here in the forum.
To delete the files and subdirectories of a folder you can use
Remove-Item -Path <Path to your directory> -Filter * -Recurse -Force
As you can see, if you use pure Powershell syntax it's actually self explaining and self documenting.
The desitnation folder you want to copy your files or directories to should already exist.
Best regards,
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