diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index a24a65a..a0387cb 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -29,15 +29,24 @@ jobs:
 
     - name: Jacoco Report to PR
       id: jacoco
-      uses: madrapps/jacoco-report@v1.1
+      uses: madrapps/jacoco-report@v1.3
       with:
-        path: ${{ github.workspace }}/build/reports/jacoco/testCoverage/testCoverage.xml
+        paths: ${{ github.workspace }}/build/reports/jacoco/testCoverage/testCoverage.xml
         token: ${{ secrets.GITHUB_TOKEN }}
         min-coverage-overall: 40
         min-coverage-changed-files: 60
         debug-mode: false
+        title: Code Coverage
+        update-comment: true
 
     - name: Get the Coverage info
       run: |
         echo "Total coverage ${{ steps.jacoco.outputs.coverage-overall }}"
         echo "Changed Files coverage ${{ steps.jacoco.outputs.coverage-changed-files }}"
+
+    - name: Fail PR if overall coverage is less than 80%
+      if: ${{ steps.jacoco.outputs.coverage-overall < 80.0 }}
+      uses: actions/github-script@v6
+      with:
+        script: |
+          core.setFailed('Overall coverage is less than 80%!')
diff --git a/src/main/java/com/madrapps/jacoco/operation/StringOp.java b/src/main/java/com/madrapps/jacoco/operation/StringOp.java
index be10d58..e735e51 100644
--- a/src/main/java/com/madrapps/jacoco/operation/StringOp.java
+++ b/src/main/java/com/madrapps/jacoco/operation/StringOp.java
@@ -9,4 +9,12 @@ public boolean endsWith(String source, String chars) {
     public boolean startsWith(String source, String chars) {
         return source.startsWith(chars);
     }
+
+    public boolean isEmpty(String source) {
+        return source.isEmpty();
+    }
+
+    public String toUpperCase(String source) {
+        return source.toUpperCase();
+    }
 }
diff --git a/src/main/kotlin/com/madrapps/jacoco/Math.kt b/src/main/kotlin/com/madrapps/jacoco/Math.kt
index 9352ca2..71bf9f4 100644
--- a/src/main/kotlin/com/madrapps/jacoco/Math.kt
+++ b/src/main/kotlin/com/madrapps/jacoco/Math.kt
@@ -25,4 +25,12 @@ class Arithmetic {
     fun area(a: Int, b: Int): Int {
         return a * b
     }
+
+    fun negative(a: Int): Int {
+        return -a
+    }
+
+    fun positive(a: Int): Int {
+        return a
+    }
 }
\ No newline at end of file