Worked on the vlang/v repository to enhance cross-language interoperability by addressing a type compatibility issue in the garbage collector header. Updated gc.h to use GC_word instead of u64, aligning type definitions for both standalone C and mixed V/C environments. This change reduced the risk of type mismatches when integrating thirdparty/libgc, improving build reliability for projects combining V and C code. Demonstrated a strong understanding of C programming, header-level compatibility, and library development, with careful attention to type systems and cross-language integration. The work focused on bug resolution, emphasizing precise, maintainable changes that support robust multi-language software development workflows.