[BAEL-3348] Moved code to algorithm-4

mapstruct/src/main/java/com/baeldung/mapper/SimpleSourceDestinationMapper.java

@@ -0,0 +1,14 @@
+package com.baeldung.mapper;
+
+import com.baeldung.dto.SimpleSource;
+import com.baeldung.entity.SimpleDestination;
+import org.mapstruct.Mapper;
+
+@Mapper(componentModel = "spring")
+public interface SimpleSourceDestinationMapper {
+
+    SimpleDestination sourceToDestination(SimpleSource source);
+
+    SimpleSource destinationToSource(SimpleDestination destination);
+
+}