Puzzle8 Fixes

- added junit.jupiter testing
- created tests for puzzle8
- fixed bugs for constructors
- implemented better methods for solving puzzle

pom.xml

@@ -13,4 +13,13 @@
         <maven.compiler.target>1.17</maven.compiler.target>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>5.9.2</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
 </project>