diff --git a/build.gradle.kts b/build.gradle.kts
index 72ad77e..d50e7ad 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 buildscript {
-    extra["gradle"] = "8.3"
+    extra["gradle"] = "8.4"
     extra["javaVersion"] = JavaVersion.VERSION_11
 }
 
@@ -27,7 +27,7 @@ dependencies {
     testImplementation(libs.junit)
 }
 
-val dokkaOutputDir = buildDir.resolve("docs")
+val dokkaOutputDir = layout.buildDirectory.asFile.get().resolve("docs")
 tasks {
     wrapper {
         gradleVersion = gradle
diff --git a/gradle.properties b/gradle.properties
index b247afb..451b888 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 GROUP=com.pnuema.java
-VERSION_NAME=2.3
+VERSION_NAME=2.4
 POM_ARTIFACT_ID=barcode
 
 POM_NAME=Barcode-Java
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index ac72c34..3fa8f86 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index 0adc8e1..1aa94a4 100755
--- a/gradlew
+++ b/gradlew
@@ -145,7 +145,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -153,7 +153,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -202,11 +202,11 @@ fi
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
diff --git a/local.properties b/local.properties
index 97d17a1..ac2ef9c 100644
--- a/local.properties
+++ b/local.properties
@@ -4,5 +4,5 @@
 # Location of the SDK. This is only used by Gradle.
 # For customization when using a Version Control System, please read the
 # header note.
-#Thu Jul 13 11:22:30 CDT 2023
-sdk.dir=/Users/b359923/Library/Android/sdk
+#Tue Oct 17 23:18:39 CDT 2023
+sdk.dir=C\:\\Users\\bradb\\AppData\\Local\\Android\\Sdk
diff --git a/src/main/java/com/pnuema/java/barcode/Barcode.java b/src/main/java/com/pnuema/java/barcode/Barcode.java
index 493710b..5152e06 100644
--- a/src/main/java/com/pnuema/java/barcode/Barcode.java
+++ b/src/main/java/com/pnuema/java/barcode/Barcode.java
@@ -897,7 +897,7 @@ private Image generateImage() {
                         if (getEncodedType() == EncodingType.PostNet) {
                             //draw half bars in postnet
                             if (getEncodedValue().charAt(pos) == '0') {
-                                g.fillRect(pos * iBarWidth + shiftAdjustment, (ILHeight / 2) + topLabelAdjustment, iBarWidth / 2, (ILHeight / 2) + topLabelAdjustment);
+                                g.fillRect(pos * iBarWidth + shiftAdjustment, (int) (ILHeight - ILHeight * 0.4f) + topLabelAdjustment, iBarWidth / 2, (int) (ILHeight - ILHeight * 0.4f) + topLabelAdjustment);
                             } else {
                                 g.fillRect(pos * iBarWidth + shiftAdjustment, topLabelAdjustment, iBarWidth / 2, ILHeight + topLabelAdjustment);
                             }
diff --git a/src/main/java/com/pnuema/java/barcode/symbologies/MSI.java b/src/main/java/com/pnuema/java/barcode/symbologies/MSI.java
index a8dc274..93c4018 100644
--- a/src/main/java/com/pnuema/java/barcode/symbologies/MSI.java
+++ b/src/main/java/com/pnuema/java/barcode/symbologies/MSI.java
@@ -27,77 +27,27 @@ private String encodeMSI() {
             error("EMSI-1: Numeric Data Only");
         }
 
-        String PreEncoded = getRawData();
-
-        //get checksum
-        if (encodedType == EncodingType.MSI_Mod10 || encodedType == EncodingType.MSI_2Mod10) {
-            String odds = "";
-            String evens = "";
-            for (int i = PreEncoded.length() - 1; i >= 0; i -= 2) {
-                odds = PreEncoded.toCharArray()[i] + odds;
-                if (i - 1 >= 0)
-                    evens = PreEncoded.toCharArray()[i - 1] + evens;
-            }
-
-            //multiply odds by 2
-            odds = String.valueOf(Integer.parseInt(odds) * 2);
-
-            int evensum = 0;
-            int oddsum = 0;
-            for (Character c : evens.toCharArray()) {
-                evensum += Integer.parseInt(c.toString());
-            }
-            for (Character c : odds.toCharArray()) {
-                oddsum += Integer.parseInt(c.toString());
-            }
-            int mod = (oddsum + evensum) % 10;
-            int checksum = mod == 0 ? 0 : 10 - mod;
-            PreEncoded += String.valueOf(checksum);
+        //Add Checksum
+        String withChecksum = "";
+
+        if (encodedType == EncodingType.MSI_Mod10) {
+            withChecksum = Mod10(getRawData());
+        } else if (encodedType == EncodingType.MSI_Mod11) {
+            withChecksum = Mod11(getRawData());
+        } else if (encodedType == EncodingType.MSI_2Mod10) {
+            withChecksum = Mod10(Mod10(getRawData()));
+        } else if (encodedType == EncodingType.MSI_Mod11_Mod10) {
+            withChecksum = Mod10(Mod11(getRawData()));
         }
 
-        if (encodedType == EncodingType.MSI_Mod11 || encodedType == EncodingType.MSI_Mod11_Mod10) {
-            int sum = 0;
-            int weight = 2;
-            for (int i = PreEncoded.length() - 1; i >= 0; i--) {
-                if (weight > 7) {
-                    weight = 2;
-                }
-                sum += Integer.parseInt(String.valueOf(PreEncoded.toCharArray()[i])) * weight++;
-            }
-            int mod = sum % 11;
-            int checksum = mod == 0 ? 0 : 11 - mod;
-
-            PreEncoded += String.valueOf(checksum);
-        }
-
-        if (encodedType == EncodingType.MSI_2Mod10 || encodedType == EncodingType.MSI_Mod11_Mod10) {
-            //get second check digit if 2 mod 10 was selected or Mod11/Mod10
-            String odds = "";
-            String evens = "";
-            for (int i = PreEncoded.length() - 1; i >= 0; i -= 2) {
-                odds = String.valueOf(PreEncoded.toCharArray()[i]) + odds;
-                if (i - 1 >= 0) {
-                    evens = String.valueOf(PreEncoded.toCharArray()[i - 1]) + evens;
-                }
-            }
-
-            //multiply odds by 2
-            odds = String.valueOf(Integer.parseInt(odds) * 2);
-
-            int evensum = 0;
-            int oddsum = 0;
-            for (Character c : evens.toCharArray()) {
-                evensum += Integer.parseInt(c.toString());
-            }
-            for (Character c : odds.toCharArray()) {
-                oddsum += Integer.parseInt(c.toString());
-            }
-            int checksum = 10 - ((oddsum + evensum) % 10);
-            PreEncoded += String.valueOf(checksum);
-        }
+        if (withChecksum.isEmpty())
+            error("EMSI-2: Invalid MSI encoding type");
 
+        //add start character
         String result = "110";
-        for (Character c : PreEncoded.toCharArray()) {
+
+        //add encoding
+        for (Character c : withChecksum.toCharArray()) {
             result += MSI_Code[Integer.parseInt(c.toString())];
         }
 
@@ -107,6 +57,48 @@ private String encodeMSI() {
         return result;
     }
 
+    private String Mod10(String code)
+    {
+        var odds = "";
+        var evens = "";
+        var chars = code.toCharArray();
+        for (var i = code.length() - 1; i >= 0; i -= 2)
+        {
+            odds = chars[i] + odds;
+            if (i - 1 >= 0)
+                evens = chars[i - 1] + evens;
+        }//for
+
+        //multiply odds by 2
+        odds = String.valueOf(Integer.parseInt(odds) * 2);
+
+        var evensum = 0;
+        var oddsum = 0;
+        for (Character c : evens.toCharArray())
+            evensum += Integer.parseInt(c.toString());
+        for (Character c : odds.toCharArray())
+            oddsum += Integer.parseInt(c.toString());
+        var mod = (oddsum + evensum) % 10;
+        var checksum = mod == 0 ? 0 : 10 - mod;
+        return code + checksum;
+    }
+
+    private String Mod11(String code)
+    {
+        var sum = 0;
+        var weight = 2;
+        var chars = code.toCharArray();
+        for (var i = code.length() - 1; i >= 0; i--)
+        {
+            if (weight > 7) weight = 2;
+            sum += Integer.parseInt(String.valueOf(chars[i])) * weight++;
+        }//foreach
+        var mod = sum % 11;
+        var checksum = mod == 0 ? 0 : 11 - mod;
+
+        return code + checksum;
+    }
+
     public String getEncodedValue() {
         return encodeMSI();
     }