- Remove the `hello_world` crate prefix, `HelloReply` is imported directly.
- Remove useless calls to `into()`:

error: useless conversion to the same type: `std::string::String`
  --> src/main.rs:18:22
   |
18 |             message: format!("Hello {}!", request.into_inner().name).into(),
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `format!("Hello {}!", request.into_inner().name)`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
   = note: `-D clippy::useless-conversion` implied by `-D warnings`