diff --git a/.github/workflows/check-duplicate.yml b/.github/workflows/check-duplicate.yml
new file mode 100644
index 0000000..2c24ef8
--- /dev/null
+++ b/.github/workflows/check-duplicate.yml
@@ -0,0 +1,34 @@
+name: Check Duplicate
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+permissions:
+  pull-requests: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}
+  cancel-in-progress: true
+
+jobs:
+  check-duplicate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check for duplicates
+        shell: bash
+        run: |
+          FILE='extensions/quarto-extensions.csv'
+          COLUMN=2
+          duplicates=$(awk -F, -v col=$COLUMN '{print $col}' $FILE | sort | uniq -d)
+          if [[ -n "$duplicates" ]]; then
+            while read -r duplicate; do
+              grep -n "$duplicate" $FILE | while read -r line ; do
+                lineNumber=$(echo $line | cut -d: -f1)
+                echo "::error file=$FILE,line=$lineNumber,endLine=$lineNumber,title=Duplicate Entry::Duplicate value '$duplicate' found"
+              done
+            done <<< "$duplicates"
+            exit 1
+          fi
+          
diff --git a/extensions/quarto-extensions.csv b/extensions/quarto-extensions.csv
index f3aeafd..e264e2a 100644
--- a/extensions/quarto-extensions.csv
+++ b/extensions/quarto-extensions.csv
@@ -116,22 +116,17 @@ formats,davidcarayon/quarto-inrae-extension
 formats,fredguth/tufte-quarto
 formats,wjschne/apaquarto
 shortcodes-filters,shafayetShafee/code-fullscreen
-shortcodes-filters,shafayetShafee/hide-comment
-shortcodes-filters,leovan/quarto-pseudocode
-shortcodes-filters,shafayetShafee/material-icons
+shortcodes-filters,leovan/quarto-pseudocodematerial-icons
 shortcodes-filters,dialoa/first-line-indent
 shortcodes-filters,shafayetShafee/reveal-header
-shortcodes-filters,shafayetShafee/black-formatter
 shortcodes-filters,dialoa/recursive-citeproc
 shortcodes-filters,ute/search-replace
-shortcodes-filters,shafayetShafee/interactive-sql
 shortcodes-filters,ttalVlatt/Quarto-Docx-Horizontal-Rule
 shortcodes-filters,clearmatics/qreacto
 shortcodes-filters,data-intuitive/quarto-d2
 shortcodes-filters,kdheepak/quarto-svgbob
 shortcodes-filters,andrewheiss/quarto-wordcount
 formats,coatless/quarto-illinois
-formats,grantmcdermott/quarto-revealjs-clean
 shortcodes-filters,produnis/quarto-timer
 shortcodes-filters,dragonstyle/share-post
 shortcodes-filters,bcdavasconcelos/citetools