namespace Myshipping.Core;
public static class LetterIndexUtil
{
    /// <summary>
    /// 根据当前字母获取它在26个英文字母中的下一个字母
    /// </summary>
    public static char GetNextLetter(char currentLetter)
    {
        if (currentLetter == 'z') return 'a';
        if (currentLetter == 'Z') return 'A';
        return (char)(currentLetter + 1);
    }
}