fix: Make mapper static

test/np/com/krrish/MapperTest.java

@@ -5,17 +5,11 @@ import org.junit.jupiter.api.*;
 import static org.junit.jupiter.api.Assertions.*;
 
 class MapperTest {
-    private Mapper mapper;
-
-    @BeforeEach
-    void setUp() {
-        mapper = new Mapper();
-    }
 
     @Test
     void testEmptyFieldsMap() {
         Source source = new Source();
-        Object destination = mapper.map(source, "np.com.krrish.Destination");
+        Object destination = Mapper.map(source, "np.com.krrish.Destination");
         assertEquals(Destination.class, destination.getClass());
     }
 
@@ -25,7 +19,7 @@ class MapperTest {
         source.setFirst("first");
         source.setSecond("second");
 
-        Destination destination = (Destination) mapper.map(source, "np.com.krrish.Destination");
+        Destination destination = (Destination) Mapper.map(source, "np.com.krrish.Destination");
         assertEquals("first", destination.getFirst());
     }
 }