Cleanup.

src/main/java/de/dennisguse/opentracks/io/file/importer/GPXTrackImporter.java

@@ -326,7 +326,7 @@ public class GPXTrackImporter extends DefaultHandler implements XMLImporter.Trac
 
         if (speed != null) {
             try {
-                speedParsed = Speed.of(speed);
+                speedParsed = Speed.of(Float.parseFloat(speed));
             } catch (NumberFormatException e) {
                 throw new ParsingException(createErrorMessage(String.format(Locale.US, "Unable to parse speed: %s", speed)), e);
             }

src/main/java/de/dennisguse/opentracks/io/file/importer/TrackImporter.java

@@ -159,7 +159,7 @@ public class TrackImporter {
         // Store Markers
         updateMarkers(trackId);
 
-        contentProviderUtils.bulkInsertMarkers(markers.stream().map(it -> it.getMarker()).toList(), trackId);
+        contentProviderUtils.bulkInsertMarkers(markers.stream().map(MarkerBuilder::getMarker).toList(), trackId);
 
         //Clear up.
         trackPoints.clear();
@@ -248,7 +248,7 @@ public class TrackImporter {
     }
 
 
-    private class TrackData {
+    private static class TrackData {
         private String name;
         private UUID uuid;
         private String description;