Rust DLL Unicode conversion test

SampleUnicode.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace RustLibSample {
    static class NativeMethods {
        [DllImport("foo.dll", EntryPoint = "hello2", CharSet=CharSet.Unicode)]
        public static extern void Hello2(string a);
    }

    class Program {
        static void Main(string[] args) {
             NativeMethods.Hello2("日本ABC");
        }
    }
}