My racket project consists of several module files (e.g.: "foo.rkt", 
"bar.rkt", ...). 

The entry module file is "main.rkt"

These files call "printf" in different places of the code (But "printf" 
only can print messages to REPL).

My question is:

Is there any way to redefine "printf" in main.rkt in order to print 
messages to a file?

Thanks.

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