ex8_3

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Overview

In `netcat3`, the interface value `conn` has the concrete type `*net.TCPConn`, which represents a TCP connection. A TCP connection consists of two halves that may be closed independently using it's `CloseRead` and `CloseWrite` methods. Modify the main goroutine of `netcat3` to close only the write half of the connection so that the program will continue to print the final echoes from the `reverb1` server even after the standard input has been closed. (Doing this for the `reverb` server is harder; see Exercise 8.4.)