Pipe stdin to custom function

https://www.baeldung.com/linux/pipe-output-to-function#:~:text=A%20pipe%20in%20Bash%20takes,in%20at%20the%20command%20line.&text=Guiding%20principle%20%231%3A%20Commands%20executed,the%20process%20that%20starts%20them.

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