StringExtensions.cs

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namespace System;
 
internal static class StringExtensions
{
    internal static string SubstringTrim(this string value, int startIndex, int length)
    {
        if (length == 0)
        {
            return string.Empty;
        }
        int num = startIndex + length - 1;
        while (startIndex <= num && char.IsWhiteSpace(value[startIndex]))
        {
            startIndex++;
        }
        while (num >= startIndex && char.IsWhiteSpace(value[num]))
        {
            num--;
        }
        int num2 = num - startIndex + 1;
        if (num2 != 0)
        {
            if (num2 != value.Length)
            {
                return value.Substring(startIndex, num2);
            }
            return value;
        }
        return string.Empty;
    }
}