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Make the consumer executable and run it: 
make consumer
./consumer
You should see output resembling this: 
** Message: 20:22:48.849: Consumed event from topic purchases: key = eabara value = batteries
** Message: 20:22:48.849: Consumed event from topic purchases: key = jbernard value = t-shirts
** Message: 20:22:48.849: Consumed event from topic purchases: key = eabara value = gift card
** Message: 20:22:48.849: Consumed event from topic purchases: key = jbernard value = batteries
** Message: 20:22:48.849: Consumed event from topic purchases: key = eabara value = alarm clock
** Message: 20:22:48.849: Consumed event from topic purchases: key = eabara value = t-shirts
** Message: 20:22:48.849: Consumed event from topic purchases: key = awalther value = alarm clock
** Message: 20:22:48.849: Consumed event from topic purchases: key = htanaka value = gift card
** Message: 20:22:48.849: Consumed event from topic purchases: key = awalther value = gift card
** Message: 20:22:48.849: Consumed event from topic purchases: key = sgarcia value = alarm clock
** Message: 20:22:48.849: Consumed event from topic purchases: key = jsmith value = alarm clock
** Message: 20:22:48.849: Consumed event from topic purchases: key = sgarcia value = book
** Message: 20:22:48.849: Consumed event from topic purchases: key = jsmith value = alarm clock
** Message: 20:22:48.849: Consumed event from topic purchases: key = sgarcia value = t-shirts
** Message: 20:22:48.849: Consumed event from topic purchases: key = sgarcia value = batteries
Rerun the producer to see more events, or feel free to modify the code as necessary to create more or different events. Once you are done, enter Ctrl-C to terminate the consumer application.