how to call a stored function from another stored function? even possible?

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I have a stored functionA that returns void

Inside there I have a line that says:

   select functionB();

and it gives this error.

ERROR:  query has no destination for result data

HINT:  If you want to discard the results of a SELECT, use PERFORM instead.

CONTEXT:  PL/pgSQL function "functionA" line 13 at SQL statement

********** Error **********

any ideas?