[racket] help me speed up string split?

From: Sam Tobin-Hochstadt (samth at cs.indiana.edu)
Date: Wed Jun 18 18:55:25 EDT 2014

> I'll stick to for/list + in-port + read

Note that this combination is nicely packaged up as `(port->list)`,
and there's a couple optional arguments and also `file->list` for
other versions of this.

Sam

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