Esp32 Arduino it is easy to create a function two minutes.

How to create a void function from existing working code in the Arduino framework. This example uses an esp32 board. The video is 4 1/2 minutes but the actual process is about 2 minutes. long The other two minues is the uploading and testing. This is a void function, a function that does not return any values. The development environment is visual micro running on top of visual studio, but it would work exactly the same way in the Arduino IDE. As you can see it is actually very simple, but I hate to tell you how many hours I spent till I finally "got it". Some references can be found here
https://prosperityconsulting.com/arduino-functions-and-passing-arguments-or-variables/