Issuing RPCs

In this part, you will send requests to your server by invoking RPCs from the client.

Currently, src/client.rs contains an example function for sending an Example RPC. In a similar manner, implement the echo function to first connect to the server, then send an ECHO RPC.

To retrieve an EchoReply from a Response<EchoReply>, you may find the into_inner function useful. You may want to take a look at how the example function recovers an ExampleReply from a Response<ExampleReply>.

You should now be able to run ./target/debug/client echo test and get an output of test. Make sure you compile your code with cargo b and that your server is running first.