book controller - Asp Net Core 5 web API versioning

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace AspNetCore5WebAPIVersioning.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class BookController : ControllerBase
    {
        [HttpGet]
        public string Get()
        {
            return "This string is for testing";
        }
    }
}