Power Query Custom Function colum as text

Hi
if I have a custom function ;

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but I do not want the column hard coded Text.Split( [Text], " "),

so I added the column as a variable in the function, ( atable as table, col as text)=>

but this does not seem to work and not sure why? I did think Table.Column( atable , col ) but pretty sure this would be a list so no good ,
anyway end up with the added column but it's blank, what am I doing wrong.

Richard.

Thanks, yes, it does,

Richard