flatten flux command and fix function examples overwrite each other

[TobiasNx]

https://metafacture.org/playground/?example=flatten

but
https://github.com/metafacture/metafacture-playground/blob/main/resources/examples/Flux_Commands/flatten
https://github.com/metafacture/metafacture-playground/blob/main/resources/examples/Fixes/flatten