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

namespace 報到系統客戶端
{
    internal class Utils
    {
        /// <summary>
        /// 手機號轉隱碼輸出(前4後3)
        /// </summary>
        /// <param name="mobile"></param>
        /// <returns></returns>
        public static string HideMobile(string mobile)
        {
            if (string.IsNullOrEmpty(mobile))
                return string.Empty;

            if (mobile.Length >= 7)
                return mobile.Substring(0, 4) + "***" + mobile.Substring(mobile.Length - 3);

            return "***";
        }
    }
}