Added more code to the syncers module

It's not 100 percent done yet, I'll work on other modules

src/syncers/upload.rs

@@ -40,7 +40,15 @@ impl Upload {
 
 
     fn retrieve_url(&self, song: &models::song::Song) -> String {
-        let mut url: String = String::new();
+        // let mut url: String = String::new();
+        let api = &self.api;
+        let mut url: String = String::from(&api.url);
+        url += &String::from("api/");
+        url += &String::from(&api.version);
+        url += &String::from("/");
+        url += &String::from(&api.endpoint);
+        // url += &String::from("/");
+        // url += &song.id.unwrap().to_string();
 
         return url;
     }