如何将Java接口代码转换为kotlin代码？

我想将一些Java代码转换为kotlin。 /Create handle for the RetrofitInstance interface/ GetDataService service = RetrofitClientInstance.getRetrofitInstance().create(GetDataService.class);

class RetrofitClientInstance {

var retrofit: Retrofit?=null
var BASE_URL = "10.80.7.30:3000"

 fun getRetrofitInstnace() :Retrofit {
    if (retrofit == null) {
        retrofit = retrofit2.Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build()
    }
    return retrofit!!
}

}

interface MovieService {

@GET("/movie/:id/script")
fun getCurrentMovieData(
    @Path("id") id : Int
) : Call<Movie>

@GET("/movie/script")
fun getMoviesData() : Call<List<Movie>>

}