ping method
or: void metro() {} for putting messages to move. PING, Putting messages in queue or sending them immediately. void ping(Baker sender, receiver, var key) {
Implementation
void ping(String sender, receiver, key, msg) {
print(' :ping: is used.. hooray!! S: $sender R: $receiver K: $key ');
buf.writeln(':con:buf: :ping: is used..S: $sender R: $receiver K: $key ');
/// code
}