garden_client/Assets/AtlasUtility/Script/ExPath.cs

namespace AtlasUtility
{
    using System.IO;

    using UnityEngine;

    public static class ExPath
    {
        public static string GetRelativePath(this string path)
        {
            return "Assets" + path.Replace(Application.dataPath, "");
        }

        public static string GetUnRepeatFileName(this string fileName)
        {
            string extension = Path.GetExtension(fileName);
            string directory = Path.GetDirectoryName(fileName);
            string name = Path.GetFileNameWithoutExtension(fileName);

            int count = 0;

            string newFileName = $"{directory}/{name}{extension}";

            while (File.Exists(newFileName))
            {
                count++;

                newFileName = $"{directory}/{name} ({count}){extension}";
            }

            return newFileName;
        }
    }
}