trailing spaces and regex issues

Author: varada610

src/main/java/com/thealgorithms/matrix/matrixexponentiation/Fibonacci.java

@@ -2,7 +2,6 @@
 
 import com.thealgorithms.matrix.utils.MatrixUtil;
 import java.math.BigDecimal;
-import java.util.Scanner;
 
 /**
  * @author Anirudh Buvanesh (https://github.com/anirudhb11) For more information

src/main/java/com/thealgorithms/matrix/utils/MatrixUtil.java

@@ -9,7 +9,7 @@
  * @author: caos321
  * @date: 31 October 2021 (Sunday)
  */
-public class MatrixUtil {
+public final class MatrixUtil {
 
     private MatrixUtil() {
     }
@@ -40,7 +40,7 @@ public static void validateInputMatrix(double[][] matrix) {
             throw new IllegalArgumentException("The input matrix cannot be jagged");
         }
     }
-    
+
     private static boolean hasValidRows(double[][] matrix) {
         for (double[] row : matrix) {
             if (row == null || row.length == 0) {

src/main/java/com/thealgorithms/puzzlesandgames/WordBoggle.java

@@ -8,7 +8,7 @@
 import java.util.Set;
 
 public final class WordBoggle {
-    
+
     private WordBoggle() {
     }
     /**

src/test/java/com/thealgorithms/matrix/MirrorOfMatrixTest.java

@@ -42,7 +42,7 @@ void testMirrorMatrixMultipleRowsOneColumnMatrix() {
     void testMirrorMatrixNullInput() {
         double[][] originalMatrix = null;
         Exception e = assertThrows(IllegalArgumentException.class, () -> MirrorOfMatrix.mirrorMatrix(originalMatrix));
-        assertEquals("The input matrix cannot be null", e.getMessage());    
+        assertEquals("The input matrix cannot be null", e.getMessage());
     }
 
     @Test