Open two tabs - client runs in one tab, service runs in another tab.
To compile the service, "make service". To compile the client, "make client".
$ bin/caesar_service --help
$ bin/caesar_service --version
$ bin/caesar_service -h
$ bin/caesar_service -d
$ bin/caesar_service
$ bin/caesar_client --help
$ bin/caesar_client --version
$ bin/caesar_client -h
$ bin/caesar_client -m hello -s 2 -q client1
$ bin/caesar_client -m hello -s 2 -q client1 -p 9