refactor: remove useless clone-on-write

src/main.rs

@@ -508,11 +508,11 @@ fn main() -> Result<()> {
                                 std::str::from_utf8_unchecked(&random_hex)
                             };
 
-                            Some(Cow::from(random))
+                            Some(random)
                         }
                         Method::Counter => {
                             let count = counter.fetch_add(1, Ordering::Relaxed) + 1;
-                            Some(Cow::from(count_buffer.format(count)))
+                            Some(count_buffer.format(count))
                         }
                         _ => None,
                     };