Charlie worked on the sysprog21/lkmpg repository, focusing on improving the reliability of kernel module examples through targeted refactoring. He addressed inconsistencies in kernel version conditional logic by standardizing all version checks to use greater than or equal to operators, replacing previous less than comparisons. This change, implemented in C, enhanced the maintainability and readability of conditional compilation across multiple example files, reducing the risk of miscompilation in different Linux kernel environments. Although no new features were added during this period, Charlie’s work in kernel development demonstrated careful attention to code quality and long-term project consistency within the repository.