Golang Price Calculator

A modular Go (Golang) CLI project that reads product prices, applies customizable tax rates, and outputs tax-included prices in JSON format.

✅ Features:

• Reads prices from a text file or CLI input (swappable IO Managers).
• Applies multiple tax rates (0%, 7%, 10%, 15%).
• Outputs structured JSON files for each tax rate.
• Clean, modular architecture using interfaces and package separation.

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📂 Project Structure:

• main.go – Entry point, loops through defined tax rates.
• prices/ – Core logic for tax calculation and job processing.
• fileManager/ – File I/O operations (reading input, writing JSON output).
• conversion/ – Utility to convert string slices to float64.
• cmdmanager/ – (Optional) CLI-based input/output manager for interactive usage.
• iomanager/ – IOManager interface for flexible input/output implementations.

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⚙️ How It Works:

1. Prices are read from prices.txt.
2. For each tax rate, a TaxInclPriceJob is created.
3. It calculates the tax-included price for each input price.
4. Results are saved in JSON files like result_0.json, result_7.json, etc.

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📄 Example Output (result_7.json)

{
  "tax_rate": 0.07,
  "input_prices": [10.49, 12, 15.89, 9.99],
  "tax_included_prices": {
    "10.49": "11.22",
    "12.00": "12.84",
    "15.89": "17.00",
    "9.99": "10.69"
  }
}

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🚀 How to Run:

go run main.go

Make sure prices.txt exists in the root directory with one price per line.

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