Refactoring and clean-up. It is better organized, but the very basic data structures

of the maze are not really suited for Wilson's algorithm.

Another refactoring will be required.

pom.xml

@@ -74,6 +74,11 @@
             <groupId>io.vavr</groupId>
             <artifactId>vavr</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>33.2.1-jre</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.pdfbox</groupId>
             <artifactId>pdfbox</artifactId>