private static string Ctor(char c, int count)
{
if (count <= 0)
{
if (count == 0)
{
return(Empty);
}
throw new ArgumentOutOfRangeException(nameof(count), SR.ArgumentOutOfRange_NegativeCount);
}
string result = FastAllocateString(count);
if (c != '\0')
{
SpanHelpers.Fill(ref result._firstChar, (uint)count, c);
}
return(result);
}