Shift.overlaps implemented, not tested

SchedulerApp/src/main/java/com/example/schedulerapp/Shift.java

@@ -153,9 +153,12 @@ public class Shift {
         return shiftID;
     }
 
-    //todo
-    // output: true if this shift and the given shift overlap at all, otherwise false
-    public boolean overlaps(Shift otherShift){
-        return false;
+    public String getPosition(){
+        return position;
+    }
+
+    // output: true if the two overlap at all, otherwise false
+    public static boolean overlaps(Shift a, Shift b){
+        return a.getEnd().isBefore(b.getStart()) && b.getEnd().isBefore(a.getStart());
     }
 }