fillEmpty method
It takes a color as a parameter, and then it calls the fill_empty
function on the Scheme interpreter
Args: color (String): The color to fill the empty cells with.
Implementation
void fillEmpty(String color, String languageCode) {
final String code = "fill_empty($color)";
_interpreter.validateOnScheme(code, SchemasReader().currentIndex);
validCommandsBuffer.add(code);
allCommandsBuffer.addAll(parseToContainer(code, languageCode));
notifyListeners();
}