Fix build warnings

src/main/java/com/mattrixwv/cipherstream/polysubstitution/LargePolybiusSquare.java

@@ -36,7 +36,7 @@ import com.mattrixwv.cipherstream.exceptions.InvalidKeywordException;
  * The Polybius square cipher is a classical encryption method that uses a 6x6 grid
  * to encode and decode messages based on the positions of letters and numbers in the grid.
  */
-public class LargePolybiusSquare extends PolybiusSquare{
+public final class LargePolybiusSquare extends PolybiusSquare{
 	private static final Logger logger = LoggerFactory.getLogger(LargePolybiusSquare.class);
 
 
@@ -239,6 +239,7 @@ public class LargePolybiusSquare extends PolybiusSquare{
 	 */
 	public LargePolybiusSquare() throws InvalidCharacterException{
 		super();
+		reset();
 	}
 	/**
 	 * Constructs a PolybiusSquare cipher instance with specified settings.
@@ -249,5 +250,6 @@ public class LargePolybiusSquare extends PolybiusSquare{
 	 */
 	public LargePolybiusSquare(boolean preserveWhitespace, boolean preserveSymbols) throws InvalidCharacterException{
 		super(preserveWhitespace, preserveSymbols);
+		reset();
 	}
 }