040000 tree b448f728d840e1212a5c0563af0f8d1cdda860f3	greeter_client
040000 tree b91239cfb3362305d0a04b8640d019434b4f107c	greeter_server
040000 tree cd7d18b65f1740e42c4fe1c1fc70e147da4baa45	helloworld
040000 tree 1b9aa5a8c9a484002880eb9fdc2f92f83a3f754e	mock_helloworld