Add car name duplicate validation

src/Vegasco.Server.Api/Cars/UpdateCar.cs

@@ -1,5 +1,6 @@
 using FluentValidation;
 using FluentValidation.Results;
+using Microsoft.EntityFrameworkCore;
 using Vegasco.Server.Api.Authentication;
 using Vegasco.Server.Api.Common;
 using Vegasco.Server.Api.Persistence;
@@ -19,7 +20,8 @@ public static class UpdateCar
 			.WithDescription("Updates a car by ID")
 			.Produces<Response>()
 			.ProducesValidationProblem()
-			.Produces(404);
+			.Produces(404)
+			.Produces(409);
 	}
 
 	public class Validator : AbstractValidator<Request>
@@ -53,7 +55,15 @@ public static class UpdateCar
 			return TypedResults.NotFound();
 		}
 
-		car.Name = request.Name;
+		var isDuplicate = await dbContext.Cars
+			.AnyAsync(x => x.Name.ToUpper() == request.Name.ToUpper(), cancellationToken);
+
+		if (isDuplicate)
+		{
+			return TypedResults.Conflict();
+		}
+
+		car.Name = request.Name.Trim();
 		await dbContext.SaveChangesAsync(cancellationToken);
 
 		Response response = new(car.Id.Value, car.Name);