add reset code functionality to restore original starter code in CodeChallenge component

Frontend/src/components/CodeChallenge.jsx

@@ -621,6 +621,32 @@ const CodeChallenge = () => {
     }
   };
 
+  // Handle reset code
+  const handleResetCode = () => {
+    const currentQuestion = getCurrentQuestion();
+    if (!currentQuestion) return;
+
+    const confirmReset = window.confirm(
+      'Are you sure you want to reset the code? This will restore the original starter code and you will lose all your current changes.'
+    );
+
+    if (!confirmReset) return;
+
+    // Clear saved submission from localStorage
+    if (test && currentQuestion) {
+      localStorage.removeItem(`submission_${test.id}_${currentQuestion.id}`);
+    }
+
+    // Reset to original code template
+    const originalCode = currentQuestion.code_template || getDefaultTemplate(currentQuestion.programming_language || language);
+    setCode(originalCode);
+    
+    // Clear terminal output
+    setTerminalOutput([
+      { type: 'system', content: '✓ Code reset to original starter code' }
+    ]);
+  };
+
   // Handle final test submission
   const handleSubmitTest = async () => {
     if (!test) {
@@ -883,7 +909,12 @@ const CodeChallenge = () => {
                       <option value="C++">C++</option>
                       <option value="C">C</option>
                     </select>
-                    <button className="reset-code-btn">
+                    <button 
+                      className="reset-code-btn"
+                      onClick={handleResetCode}
+                      disabled={isRunning}
+                      title="Reset code to original starter template"
+                    >
                       <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                         <polyline points="16 18 22 12 16 6"></polyline>
                         <polyline points="8 6 2 12 8 18"></polyline>