Trim a UUID variable - how should this work?

There is likely something very basic I'm doing wrong here. My goal is to trim the UUID to 8 characters, that which I have created as a "appid" variable name.

Here I'm attempting to trim the string to the first 8 characters. It does appear this step of the function is working the way I was hoping; no characters seem to be getting trimmed at all.

Do I have the inputs correct?

  1. Create the UUID

  2. Add the UUID "appid" as the variable to trim

  3. Set the starting "0" up through the first 8 characters

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