fixbug

@@ -18,5 +18,7 @@ public class CholesterolObservationModel extends ObservationModel{
     }
 
     @Override
-    public String getDateTime() { return observation.getEffectiveDateTimeType().asStringValue(); }
+    public String getDateTime() {
+        return observation.getEffectiveDateTimeType().asStringValue();
+    }
 }

@@ -2,7 +2,7 @@ package com.sw.laryngoscope.model.observation;
 
 import org.hl7.fhir.r4.model.Observation;
 
-public class ObservationModel {
+public abstract class ObservationModel {
     protected Observation observation;
 
     ObservationModel(Observation observation) {