diff --git a/config/custom-checkstyle.xml b/config/custom-checkstyle.xml
new file mode 100644
index 0000000..71d9e97
--- /dev/null
+++ b/config/custom-checkstyle.xml
@@ -0,0 +1,200 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+
+    Modified version of sun coding conventions
+
+  Checkstyle configuration that checks the sun coding conventions from:
+
+    - the Java Language Specification at
+      https://docs.oracle.com/javase/specs/jls/se11/html/index.html
+
+    - the Sun Code Conventions at
+https://www.oracle.com/java/technologies/javase/codeconventions-contents.html
+
+    - the Javadoc guidelines at
+      https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html
+
+    - the JDK Api documentation https://docs.oracle.com/en/java/javase/11/
+
+    - some best practices
+
+  Checkstyle is very configurable. Be sure to read the documentation at
+  https://checkstyle.org (or in your downloaded distribution).
+
+  Most Checks are configurable, be sure to consult the documentation.
+
+  To completely disable a check, just comment it out or delete it from the file.
+  To suppress certain violations please review suppression filters.
+
+  Finally, it is worth reading the documentation.
+
+-->
+
+<module name="Checker">
+    <!--
+      If you set the basedir property below, then all reported file
+      names will be relative to the specified directory. See
+      https://checkstyle.org/config.html#Checker
+
+      <property name="basedir" value="${basedir}"/>
+  -->
+    <property name="severity" value="error" />
+
+    <property name="fileExtensions" value="java, properties, xml" />
+
+    <!-- Excludes all 'module-info.java' files              -->
+    <!-- See https://checkstyle.org/config_filefilters.html -->
+    <module name="BeforeExecutionExclusionFileFilter">
+        <property name="fileNamePattern" value="module\-info\.java$" />
+    </module>
+
+    <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
+    <module name="SuppressionFilter">
+        <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
+            default="checkstyle-suppressions.xml" />
+        <property name="optional" value="true" />
+    </module>
+
+    <!-- Checks that a package-info.java file exists for each package.     -->
+    <!-- See https://checkstyle.org/config_javadoc.html#JavadocPackage -->
+    <module name="JavadocPackage" />
+
+    <!-- Checks whether files end with a new line.                        -->
+    <!-- See https://checkstyle.org/config_misc.html#NewlineAtEndOfFile -->
+    <module name="NewlineAtEndOfFile" />
+
+    <!-- Checks that property files contain the same keys.         -->
+    <!-- See https://checkstyle.org/config_misc.html#Translation -->
+    <module name="Translation" />
+
+    <!-- Checks for Size Violations.                    -->
+    <!-- See https://checkstyle.org/config_sizes.html -->
+    <module name="FileLength" />
+    <module name="LineLength">
+        <property name="max" value="100" />
+        <property name="fileExtensions" value="java" />
+    </module>
+
+    <!-- Checks for whitespace                               -->
+    <!-- See https://checkstyle.org/config_whitespace.html -->
+    <module name="FileTabCharacter" />
+
+    <!-- Miscellaneous other checks.                   -->
+    <!-- See https://checkstyle.org/config_misc.html -->
+    <module name="RegexpSingleline">
+        <property name="format" value="\s+$" />
+        <property name="minimum" value="0" />
+        <property name="maximum" value="0" />
+        <property name="message" value="Line has trailing spaces." />
+    </module>
+
+    <!-- Checks for Headers                                -->
+    <!-- See https://checkstyle.org/config_header.html   -->
+    <!-- <module name="Header"> -->
+    <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
+    <!--   <property name="fileExtensions" value="java"/> -->
+    <!-- </module> -->
+
+    <module name="TreeWalker">
+
+        <!-- Checks for Javadoc comments.                     -->
+        <!-- See https://checkstyle.org/config_javadoc.html -->
+        <module name="InvalidJavadocPosition" />
+        <module name="JavadocMethod" />
+        <module name="JavadocType" />
+        <module name="JavadocVariable" />
+        <module name="JavadocStyle" />
+        <module name="MissingJavadocMethod" />
+
+        <!-- Checks for Naming Conventions.                  -->
+        <!-- See https://checkstyle.org/config_naming.html -->
+        <module name="ConstantName" />
+        <module name="LocalFinalVariableName" />
+        <module name="LocalVariableName" />
+        <module name="MemberName" />
+        <module name="MethodName" />
+        <module name="PackageName" />
+        <module name="ParameterName" />
+        <module name="StaticVariableName" />
+        <module name="TypeName" />
+
+        <!-- Checks for imports                              -->
+        <!-- See https://checkstyle.org/config_imports.html -->
+        <module name="AvoidStarImport" />
+        <module name="IllegalImport" /> <!-- defaults to sun.* packages -->
+        <module name="RedundantImport" />
+        <module name="UnusedImports">
+            <property name="processJavadoc" value="false" />
+        </module>
+
+        <!-- Checks for Size Violations.                    -->
+        <!-- See https://checkstyle.org/config_sizes.html -->
+        <module name="MethodLength" />
+        <module name="ParameterNumber" />
+
+        <!-- Checks for whitespace                               -->
+        <!-- See https://checkstyle.org/config_whitespace.html -->
+        <module name="EmptyForIteratorPad" />
+        <module name="GenericWhitespace" />
+        <module name="MethodParamPad" />
+        <module name="NoWhitespaceAfter" />
+        <module name="NoWhitespaceBefore" />
+        <module name="OperatorWrap" />
+        <module name="ParenPad" />
+        <module name="TypecastParenPad" />
+        <module name="WhitespaceAfter" />
+        <module name="WhitespaceAround" />
+
+        <!-- Modifier Checks                                    -->
+        <!-- See https://checkstyle.org/config_modifier.html -->
+        <module name="ModifierOrder" />
+        <module name="RedundantModifier" />
+
+        <!-- Checks for blocks. You know, those {}'s         -->
+        <!-- See https://checkstyle.org/config_blocks.html -->
+        <module name="AvoidNestedBlocks" />
+        <module name="EmptyBlock" />
+        <module name="LeftCurly" />
+        <module name="NeedBraces" />
+        <module name="RightCurly" />
+
+        <!-- Checks for common coding problems               -->
+        <!-- See https://checkstyle.org/config_coding.html -->
+        <module name="EmptyStatement" />
+        <module name="EqualsHashCode" />
+        <module name="HiddenField" />
+        <module name="IllegalInstantiation" />
+        <module name="InnerAssignment" />
+        <module name="MagicNumber" />
+        <module name="MissingSwitchDefault" />
+        <module name="MultipleVariableDeclarations" />
+        <module name="SimplifyBooleanExpression" />
+        <module name="SimplifyBooleanReturn" />
+
+        <!-- Checks for class design                         -->
+        <!-- See https://checkstyle.org/config_design.html -->
+        <module name="DesignForExtension" />
+        <module name="FinalClass" />
+        <module name="HideUtilityClassConstructor" />
+        <module name="InterfaceIsType" />
+        <module name="VisibilityModifier" />
+
+        <!-- Miscellaneous other checks.                   -->
+        <!-- See https://checkstyle.org/config_misc.html -->
+        <module name="ArrayTypeStyle" />
+        <module name="FinalParameters" />
+        <module name="TodoComment" />
+        <module name="UpperEll" />
+
+        <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
+        <module name="SuppressionXpathFilter">
+            <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}"
+                default="checkstyle-xpath-suppressions.xml" />
+            <property name="optional" value="true" />
+        </module>
+
+    </module>
+
+</module>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 19759b6..c6d84c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,6 +44,7 @@
                         <id>checkstyle-check</id>
                         <phase>verify</phase>
                         <configuration>
+                            <configLocation>config/custom-checkstyle.xml</configLocation>
                             <failOnViolation>true</failOnViolation>
                             <consoleOutput>true</consoleOutput>
                             <failsOnError>true</failsOnError>