client: remove unused code

client/src/main.rs

@@ -195,19 +195,6 @@ impl From<&str> for CommandError {
     }
 }
 
-impl CommandError {
-    fn new<S, E>(message: S, inner: E) -> Self
-    where
-        S: AsRef<str>,
-        E: std::error::Error + 'static,
-    {
-        Self {
-            message: message.as_ref().to_owned(),
-            inner: Some(Box::new(inner)),
-        }
-    }
-}
-
 async fn handle_command() -> Result<(), Box<dyn std::error::Error>> {
     env_logger::init();