asSatsInt method
assumes the string is already in sats.
Implementation
int asSatsInt() {
String text = removeChars(
split('.').first,
chars: strings.punctuation + strings.whiteSapce,
);
if (text.length > 19) {
text = text.substring(0, 19);
}
if (text == '') {
return 0;
}
//if (int.parse(text) > 21000000000) {
// return 21000000000;
//}
return text.asInt();
}