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/// <summary>
/// Returns the input string with the first character converted to uppercase
/// </summary>
public static string FirstLetterToUpperCase(this string s)
{
        if (string.IsNullOrEmpty(s))
                throw new ArgumentException("There is no first letter");

        char[] a = s.ToCharArray();
        a[0] = char.ToUpper(a[0]);
        return new string(a);
}