code: func GetCoordsFromCellIDString(cellIDString string) (x, y int, error error) {
  	var letterPart string = strings.Map(letterOnlyMapF, cellIDString)
  	y, error = strconv.Atoi(strings.Map(intOnlyMapF, cellIDString))
  	if error != nil {
  		return x, y, error
  	}
  	y -= 1 // Zero based
  	x = ColLettersToIndex(letterPart)
  	return x, y, error
  }
docs: // GetCoordsFromCellIDString returns the zero based cartesian
  // coordinates from a cell name in Excel format, e.g. the cellIDString
  // "A1" returns 0, 0 and the "B3" return 1, 2.