Duplicate the question

src/app/page.tsx

@@ -115,6 +115,24 @@ export default function QuestionBuilder() {
     setIsEditModalOpen(false);
   };
 
+  const handleDuplicateQuestion = (question: GeneratedQuestion) => {
+    const duplicatedQuestion: GeneratedQuestion = {
+      ...question,
+      id: Date.now().toString(), // Generate new ID
+      stem: `${question.stem} (Copy)`, // Add "(Copy)" to distinguish
+      content: {
+        ...question.content,
+        Question: `${question.content.Question} (Copy)`, // Also update the content.Question
+      },
+      createdAt: new Date(), // Update creation date
+    };
+    
+    setQuestions(prev => [...prev, duplicatedQuestion]);
+    
+    // Simple feedback - you could replace this with a proper toast notification
+    console.log('Question duplicated successfully!');
+  };
+
   return (
     <div className="min-h-screen bg-gray-50 dark:bg-[#212529]">
       {/* Header */}
@@ -308,10 +326,7 @@ export default function QuestionBuilder() {
             onQuestionReorder={reorderQuestions}
             onQuestionEdit={handleEditQuestion}
             editingQuestionId={editingQuestion?.id || null}
-            onQuestionDuplicate={(question) => {
-              // TODO: Implement duplicate functionality
-              console.log('Duplicate question:', question);
-            }}
+            onQuestionDuplicate={handleDuplicateQuestion}
             onQuestionPreview={(question) => {
               // TODO: Implement preview functionality
               console.log('Preview question:', question);