Re-implement the Loan Interest Calculator for banking customers using functional programming, domain-driven design, and test-driven development.

• Produce a small console application.
• Use an in-memory store.
• Simple interest formula: https://www.investopedia.com/terms/s/simple_interest.asp

1. A user can provide input parameters to calculate a loan.
2. The system should generate an output containing the loan calculation results.
3. A user can access historic calculations that they can update with new input parameters.

1. Start Date (date)
2. End Date (date)
3. Loan Amount (amount field)
4. Loan Currency (currency)
5. Base Interest Rate (percentage)
6. Margin (percentage), where Total Interest Rate = Base Interest Rate + Margin

1. Daily Interest Amount without margin
2. Daily Interest Amount Accrued
3. Accrual Date
4. Number of Days elapsed since the Start Date of the loan
5. Total Interest - calculated over the given period

• Functional Programming information - https://www.bastienfoucher.net/series/functional-ddd-csharp
• Functional programming approach inspired by https://github.com/BastienFoucher/Grenat.Functional.DDD