--whitelistand--blacklistoptions to keep/remove certain extensions--filteroption for finer control over output-i/--inputand-o/--outputoptions to read/write to files instead of stdin/stdout- refactored codebase for modularity
--whitelist and --blacklist options to keep/remove certain extensions--filter option for finer control over output-i/--input and -o/--output options to read/write to files instead of stdin/stdout