A robust URL normalization function that converts URLs to a canonical form for comparison by lowercasing scheme and netloc, removing default ports (:80, :443), and stripping trailing slashes from the path while preserving query parameters and fragments. Demonstrates attention to edge cases in URL handling.

A specialized emoji detection and removal system designed for Markdown contexts. It identifies emoji characters using Unicode ranges rather than regex, removes them from link text and adjacent descriptions (both bracketed and parenthesized), and properly handles whitespace collapsing after removal. Shows non-obvious skill in handling Unicode edge cases and context-aware text processing.

An efficient link checker that detects domain parking and ad redirects using a two-phase HTTP request strategy (HEAD first, GET only for cross-domain redirects). It maintains extensive lists of known parking domains and parking-related phrases in page content, handles SSL certificate issues, and provides detailed reporting. Demonstrates skill in network efficiency optimization and robust error handling for web scraping tasks.

A suite of duplicate detection and removal functions for text processing. Includes: 1) General duplicate line detection with configurable normalization, 2) URL-specific duplicate removal using URL normalization, and 3) Adjacent exact link duplicate removal that collapses runs of identical Markdown links. Shows attention to preserving first occurrences and handling various equality definitions.