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This PR is to implement the Exchange Rate Provider using the publicly available API of the Czech National Bank which I found online.
I have created a MVP that satisfies the requirements. I have tried to keep the solution as simple and concise as possible so it is easily maintainable. I have considered a few principles when developing this project such as SOLID and DRY both of which help keep the code high quality, maintainable and reusable.
I have added a Nunit test project which contains a suite of tests for the service and the provider. I have used private methods in the files to reduce the repeatition of code that comes from mocking up the httpClient.
I have also updated the project to .NET8 to keep the solution up to date with the industry. I have introduced file-scoped namespaces to reduce excess noise in files.