books/backend/Books.Api/EventFlow/Customs/Casing.cs

using System.Reflection;

namespace Books.Api.EventFlow.Customs;

public static class Casing
{
    public static string ToSnakeCase(this string input)
    {
        if (string.IsNullOrEmpty(input))
            return input;

        var stringBuilder = new System.Text.StringBuilder();
        for (var i = 0; i < input.Length; i++)
        {
            var c = input[i];
            if (char.IsUpper(c))
            {
                if (i > 0)
                {
                    stringBuilder.Append('_');
                }
                stringBuilder.Append(char.ToLower(c));
            }
            else
            {
                stringBuilder.Append(c);
            }
        }
        return stringBuilder.ToString();
    }
}