During March 2025, Arnold Lukacs developed and integrated a complete doubly linked list data structure in C for the Data-structures-and-algorithms-2025/DSA_courses_for_teamwork repository. He designed a robust API supporting node creation, insertion at various positions, and bidirectional traversal, enabling both queue and list operations for team coursework. By updating the CMakeLists.txt, Arnold ensured seamless build integration with existing components, improving maintainability and reusability of core data structures. His work focused on C programming and data structures, delivering a tested, reusable module that supports reliable list manipulation and enhances the foundation for future DSA course projects without introducing new bugs.