This is minor optimisation to the tcp_server code:
Note that two lines, one is 'recv(%d) msg from client', the other is 'send mes error',
the second 'mes' should be 'msg', for short. The code is more readable.
This is minor optimisation to the tcp_client code:
Note that two lines, one is 'send mes error', the other is 'recv msg from server',
the first 'mes' should be 'msg', for short. The code is more readable.
