How to separate projects in asp net core web application

$ mkdir Blog.Backend.Api.Account
$ cd Blog.Backend.Api.Account
$ dotnet new classlib

$ dotnet add package Microsoft.AspNetCore.Mvc --version 2.2.0
$ dotnet add package Microsoft.Extensions.Logging --version 2.2.0

public static class ServicesConfigureExtesion
{
    public static IServiceCollection AddAccountApiController(this IServiceCollection services)
    {
        // 옮긴 컨트롤러 클래스를 IoC 컨테이너에 등록합니다.
        services.AddTransient<UserController>();
        services.AddTransient<AccountController>();
        return services;
    }

    public static IMvcBuilder AddAccountApiController(this IMvcBuilder builder)
    {
        var currentAssembly = typeof(ServicesConfigureExtesion).GetTypeInfo().Assembly;

        builder
            .AddApplicationPart(currentAssembly)
            ;

        return builder;
    }
}

public void ConfigureServices(IServiceCollection services)
{
    /* 중략 */

    services
        /* IServiceCollection 확장메서드 */
        /* IoC 컨테이너에 타입을 등록 */
        .AddAccountApiController()
        .AddMvc()
        /* IMvcBuilder 확장메서드 */
        /* 다른 어셈블리의 컨트롤러를 사용하도록 구성 */
        .AddAccountApiController()
        .SetCompatibilityVersion(Microsoft.AspNetCore.Mvc.CompatibilityVersion.Version_2_2)
        .AddControllersAsServices()
        ;

    /* 중략 */
}