line method Null safety
Implementation
static Future<void> line({
String ch = '-',
int len = 31,
}) async {
resetFontSize();
await printText(List.filled(len, ch[0]).join());
}
static Future<void> line({
String ch = '-',
int len = 31,
}) async {
resetFontSize();
await printText(List.filled(len, ch[0]).join());
}