捉个虫：下标运算符参数越界未处理

work20220401/neoString/CString.cpp

@@ -149,5 +149,5 @@ std::istream &operator>>(std::istream &inputStream, const CString &source) {
 }
 
 char CString::operator[](const int i) const {
-    return data[i];
+    return (i < MAX_LENGTH) ? data[i] : '\0';
 }