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Although the revised analyze_trades function uses the free
function to reclaim the memory consumed by obsolete and inaccessible
structure objects, those objects themselves may contain pointers to
character arrays created at run time. In an earlier version of
analyze_trades, shown in Segment 514, you saw, for example,
that it is possible to insert a pointer to a trade-describing string that
occupies space allocated at run time.
To reclaim such memory, you need to place another call to
free just before the structure-object-reclaiming free.
... free (trade_pointers[limit] -> description); free (trade_pointers[limit]); ...