- Add 'benchmark' target to Makefile that extracts books archive and runs bench.py - Reorder includes in isspam.c (rstr.h before rstring_list.h) - Replace file_exists() with case-insensitive stricmp() for forbidden word matching - Remove unused flags (show_capitalized, show_sentences, etc.) and stripws() function - Add memory usage comment and fix trailing newline in rstr.h header guard