Command message now is stopped at newline

hw9/task1/src/lib.rs

             let mut str = x.split_whitespace();
             match str.next() {
                 Some("STAGE") => {
-                    let msg = m[6..].trim_left();
+                    let msg = x[6..].trim_left();
                     Ok(Command::Stage(msg.to_string()))
                 }
                 Some("CONTROL") => {
-                    let cmd = m[8..].trim_left();
+                    let cmd = x[8..].trim_left();
                     Ok(Command::Control(cmd.to_string()))
                 }
                 Some("RETRIEVE") => Ok(Command::Retrieve),