message: Use char instead of string for single character separator
diff: @@ -136,7 +136,7 @@ fn parse_msg_args(args: &[u8]) -> io::Result<ControlOp> {
  let a = String::from_utf8_lossy(args);
  // subject sid <reply> msg_len
  // TODO(dlc) - convert to nom.
  - let args: Vec<&str> = a.split(" ").collect();
  + let args: Vec<&str> = a.split(' ').collect();
  let (subject, len_index, reply) = match args.len() {
  3 => (args[0], 2, None),
  4 => (args[0], 3, Some(args[2].to_owned())),
  