BUG: /leave function is not working

[caoyukun0430]

Hi Ray,

First thanks a lot for the fancy grpc lab, I learnt a lot from it!

But by following https://docs.google.com/document/d/14bSoGRLpPXEHnS_R0OY5WiKHK0IN0VjkqGYX8hXEGbA/edit# It seems that the /leave function in chat-client is not working!
this is the output from my log

com.example.chat.ChatClient listRooms
listing rooms
Room: test2
Room: test
admin-> /leave test

Is it that I might miss some codes or the function is not implemented?

Thanks!
Yukun