alert method
Prints a prominent alert box with a message
Implementation
void alert(String message) {
final border = '═' * (message.length + 4);
print('\x1B[33m╔$border╗\x1B[0m');
print('\x1B[33m║\x1B[0m $message \x1B[33m║\x1B[0m');
print('\x1B[33m╚$border╝\x1B[0m');
}