public void SplitInputChunk(IWordCounter wordCounter, string buffer)
{
var wholeBuffer = Previous + buffer;
var lastPositionOfWordBoundary = wordCounter.LastPositionOfWordBoundary(wholeBuffer);
Current = wholeBuffer.Substring(0, lastPositionOfWordBoundary);
var fromLastWordBoundaryOnwards = wholeBuffer.Substring(lastPositionOfWordBoundary);
Previous = fromLastWordBoundaryOnwards;
}