Standardized directory structures to prevent "header not found" errors.

This file name appears to refer to a specific archive for , likely a modified or curated version for a specific course or user (labeled "sc21999").

Cleaned up headers and source files for unp.h .

Pre-configured Makefiles for quick compilation on Linux/BSD environments. ✅ Why This Version?

Ready-to-run TCP/UDP echo servers and clients.