Refactor: Apply Iterator pattern to SudokuBoard

Author: KaranMishra3610

pom.xml

@@ -66,6 +66,7 @@
                     <forkNode implementation="org.apache.maven.plugin.surefire.extensions.SurefireForkNodeFactory"/>
                 </configuration>
             </plugin>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -80,6 +81,7 @@
                     </compilerArgs>
                 </configuration>
             </plugin>
+
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -99,35 +101,43 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <!-- ✅ Fixed Checkstyle -->
             <plugin>
-    <groupId>org.apache.maven.plugins</groupId>
-    <artifactId>maven-checkstyle-plugin</artifactId>
-    <version>3.6.0</version>
-    <executions>
-        <execution>
-            <id>checkstyle</id>
-            <phase>verify</phase>
-            <goals>
-                <goal>check</goal>
-            </goals>
-            <configuration>
-                <configLocation>checkstyle.xml</configLocation>
-                <consoleOutput>true</consoleOutput>
-                <includeTestSourceDirectory>true</includeTestSourceDirectory>
-                <violationSeverity>warning</violationSeverity>
-                <!-- 👇 This line makes sure violations don’t fail your build -->
-                <failOnViolation>false</failOnViolation>
-            </configuration>
-        </execution>
-    </executions>
-    <dependencies>
-        <dependency>
-            <groupId>com.puppycrawl.tools</groupId>
-            <artifactId>checkstyle</artifactId>
-            <version>11.0.0</version>
-        </dependency>
-    </dependencies>
-</plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.6.0</version>
+                <executions>
+                    <execution>
+                        <id>checkstyle</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <configLocation>checkstyle.xml</configLocation>
+                            <consoleOutput>true</consoleOutput>
+                            <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                            <violationSeverity>warning</violationSeverity>
+                            <failOnViolation>false</failOnViolation>
+                            <includes>
+                                <include>src/main/java/**/*.java</include>
+                                <include>src/test/java/**/*.java</include>
+                            </includes>
+                            <excludes>
+                                <exclude>target/**</exclude>
+                            </excludes>
+                        </configuration>
+                    </execution>
+                </executions>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>11.0.0</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
 
             <plugin>
                 <groupId>com.github.spotbugs</groupId>
@@ -150,6 +160,7 @@
                     </plugins>
                 </configuration>
             </plugin>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-pmd-plugin</artifactId>