Addressed some warnings, moved a few debug!() to trace!()

src/gtfs/structs.rs

@@ -7,24 +7,24 @@ use zip::result::ZipError;
 
 #[derive(Debug)]
 pub struct Error {
-    pub(crate) message: String,
+    pub(crate) _message: String,
 }
 
 impl From<std::io::Error> for Error {
     fn from(value: std::io::Error) -> Self {
-        return Error { message: value.to_string() }
+        return Error { _message: value.to_string() }
     }
 }
 
 impl From<reqwest::Error> for Error {
     fn from(value: reqwest::Error) -> Self {
-        return Error { message: value.to_string() }
+        return Error { _message: value.to_string() }
     }
 }
 
 impl From<ZipError> for Error {
     fn from(value: ZipError) -> Self {
-        return Error { message: value.to_string() }
+        return Error { _message: value.to_string() }
     }
 }
 
@@ -60,7 +60,7 @@ impl Preferences {
         let file_name_part = self.gtfs_url.split("/").last();
         if file_name_part.is_none() {
             error!("The config for gtfs-url is not a valid URL: {}", self.gtfs_url);
-            return Err(Error {message: String::from("Failed to refresh GTFS data")});
+            return Err(Error {_message: String::from("Failed to refresh GTFS data")});
         } 
         return Ok(String::from(file_name_part.unwrap()));
     }