Added response mappers

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

@@ -0,0 +1,15 @@
+package com.plannaplan.responses.mappers;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+import com.plannaplan.entities.User;
+import com.plannaplan.responses.models.SearchForStudentsResponse;
+
+public class UserResponseMappers {
+    public static List<SearchForStudentsResponse> mapToDefaultResponse(List<User> groups) {
+        return groups.stream().filter(Objects::nonNull).map(SearchForStudentsResponse::new)
+                .collect(Collectors.toList());
+    }
+}