A small Rust application - little improvement #1088 (#1094)

- Little change to improve readability and flexibility of "A small Rust application" sectio9n ("get-started" page)

Author: Edoardo Molinatti

templates/learn/get-started.hbs

@@ -90,12 +90,12 @@ ferris-says = "0.1"</code></pre>
 use std::io::{stdout, BufWriter};
 
 fn main() {
-    let stdout = stdout();
-    let out = b"Hello fellow Rustaceans!";
-    let width = 24;
+    let stdout  = stdout();
+    let message = String::from("Hello fellow Rustaceans!");
+    let width   = message.chars().count();
 
     let mut writer = BufWriter::new(stdout.lock());
-    say(out, width, &mut writer).unwrap();
+    say(message.as_bytes(), width, &mut writer).unwrap();
 }
     </code></pre>
     {{/fluentparam}}