colorToString method
Implementation
String colorToString(Color color) {
final aValue = color.alpha.toRadixString(16).padLeft(2, '0');
final rValue = color.red.toRadixString(16).padLeft(2, '0');
final gValue = color.green.toRadixString(16).padLeft(2, '0');
final bValue = color.blue.toRadixString(16).padLeft(2, '0');
return '#$aValue$rValue$gValue$bValue'.toUpperCase();
}