Implementation of the task - code review

BackendTaskPilot.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BackendTaskPilot", "BackendTaskPilot\BackendTaskPilot.csproj", "{85AE9448-BC75-4412-8D41-DA6C52B676D9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{85AE9448-BC75-4412-8D41-DA6C52B676D9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{85AE9448-BC75-4412-8D41-DA6C52B676D9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{85AE9448-BC75-4412-8D41-DA6C52B676D9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{85AE9448-BC75-4412-8D41-DA6C52B676D9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

BackendTaskPilot/BackendTaskPilot.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+    </PropertyGroup>
+
+</Project>

BackendTaskPilot/Program.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+var builder = WebApplication.CreateBuilder(args);
+var app = builder.Build();
+
+ExchangeRateService service = new ExchangeRateService();
+
+// REST API to get exchange rates based on input currencies
+app.MapPost("/", service.GetExchangeRates);
+
+app.Run();
+
+public struct CnbRatesResponse
+{
+    [JsonPropertyName("rates")] public List<Rate> Rates { get; set; }
+}
+
+public struct Rate
+{
+    [JsonPropertyName("currencyCode")] public string CurrencyCode { get; set; }
+    [JsonPropertyName("rate")] public float RateValue { get; set; }
+}
+
+internal class ExchangeRateService
+{
+    private const string MainCurrenciesUrl = "https://api.cnb.cz/cnbapi/exrates/daily";
+
+    public IEnumerable<Rate> GetExchangeRates(List<string> currencies)
+    {
+        HttpClient client = new HttpClient();
+
+        var data = client.GetStringAsync(MainCurrenciesUrl).Result;
+        var response = JsonSerializer.Deserialize<CnbRatesResponse>(data);
+
+        return response.Rates.Select(rate => rate).Where(rate => currencies.Contains(rate.CurrencyCode));
+    }
+}

BackendTaskPilot/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:39873",
+      "sslPort": 44314
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5018",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7250;http://localhost:5018",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

BackendTaskPilot/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

BackendTaskPilot/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}