Made ASsignm,ents Conmtroller more readable

restservice/src/main/java/com/plannaplan/responses/mappers/AssignmentResponseMappers.java

@@ -0,0 +1,20 @@
+package com.plannaplan.responses.mappers;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Groups;
+import com.plannaplan.responses.models.AssignmentResponse;
+
+public class AssignmentResponseMappers {
+    public static final List<AssignmentResponse> mapGroupsListToAssignmentResponseList(List<Groups> groups) {
+        return groups.stream().filter(Objects::nonNull).map(AssignmentResponse::new).collect(Collectors.toList());
+    }
+
+    public static final List<AssignmentResponse> mapAssignmentsListToAssignmentResponseList(
+            List<Assignment> assignments) {
+        return assignments.stream().filter(Objects::nonNull).map(AssignmentResponse::new).collect(Collectors.toList());
+    }
+}