Pass &str instead of cloning String

src/builder.rs

@@ -790,6 +790,6 @@ impl<D: Clone> ImplementationBuilder<Cron<D>> for DefaultBuilder {
     (): &<Cron<D> as Resource>::Artifact,
     user_name: <Self::Prerequisites as ToArtifact>::Artifact,
   ) -> Self::Implementation {
-    CronSymbol::new((user_name.0).0, resource.1.clone(), &StdCommandRunner)
+    CronSymbol::new((user_name.0).0, &resource.1, &StdCommandRunner)
   }
 }