Debug: The Generator That Remembers

This ReportGenerator broke in a code review — reports leak across instances, and fresh data stops appearing: ``csharp public sealed class ReportGenerator // BROKEN — do not ship this { private static readonly List<string> Cache = new(); // shared by ALL instances private readonly IFetcher _fetcher; public ReportGenerator(IFetcher fetcher) => _fetcher = fetcher; public string[] Generate() { if (Cache.Count == 0) foreach (var r in _fetcher.Fetch()) Cache.Add(...); return Cache.ToArray(); } } ` Two sins: **static state shared by every instance**, and **caching input data** the caller expects to be re-read. Write a correct ReportGenerator: no state beyond the injected IFetcher, and Generate() reflects the fetcher's *current* rows every call, formatted "1. row", "2. row" (1-based). `csharp public sealed class ReportGenerator { public ReportGenerator(IFetcher fetcher); public string[] Generate(); } ``