func (t *OverlappingStringTokeniser) Tokenise(input string) []string {

  var chunks []string

  inputLen := len(input)

  for position := 0; position < inputLen-int(t.chunkSize); position += int(t.chunkSize - t.overlapSize) {

    chunks = append(chunks, input[position:position+int(t.chunkSize)])

  }

  return chunks

}

// Compare calculates the Hamming distance between two 64-bit integers

//

// Currently, this is calculated using the Kernighan method [1]. Other methods

// exist which may be more efficient and are worth exploring at some point

//

// [1] http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetKernighan

func Compare(a uint64, b uint64) uint8 {

	v := a ^ b

	var c uint8

	for c = 0; v != 0; c++ {

		v &= v - 1

	}

	return c

}