Zack: A Lightweight Backtesting Engine in Zig

Zack is a lightweight backtesting engine written in Zig for testing trading strategies. It simulates the trading process, generating trading signals from historical OHLCV data, managing a virtual portfolio, and reporting performance. Zig's performance and memory control advantages make it ideal for this application. Currently, Zack implements a simple "buy and hold" strategy, with plans to add more sophisticated strategies, technical indicators, and performance metrics in the future.