There are blank Braille characters outside the quotes. They are hard to spot and the forum software does not change them (unlike those wrong type quotes).
Fixed version:
void setup() {
Serial.begin (38400);
}
void loop() {
int time1;
int time2;
int timestamp;
time1= millis ();
Serial.println ("⠰⡿⠿⠛⠛⠻⠿⣷");
Serial.println (" ⣀⣄⡀⠀⠀⠀⠀⢀⣀⣀⣤⣄⣀⡀");
Serial.println ("⠀⠀⠀⢸⣿⣿⣷⠀⠀⠀⠀⠛⠛⣿⣿⣿⡛⠿⠷");
Serial.println ("⠀⠀ ⠘⠿⠿⠋⠀⠀⠀⠀⠀⠀⣿⣿⣿⠇");
Serial.println ("⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠈⠉⠁");
Serial.println ("");
Serial.println ("⠀ ⣿⣷⣄⠀⢶⣶⣷⣶⣶⣤⣀");
Serial.println (" ⣿⣿⣿⠀⠀⠀⠀⠀⠈⠙⠻⠗");
Serial.println (" ⣰⣿⣿⣿⠀⠀⠀⠀⢀⣀⣠⣤⣴⣶⡄");
Serial.println ("⣠⣾⣿⣿⣿⣥⣶⣶⣿⣿⣿⣿⣿⠿⠿⠛⠃");
Serial.println (" ⢰⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡄");
Serial.println (" ⢸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡁");
Serial.println (" ⠈⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠁");
Serial.println (" ⠛⢿⣿⣿⣿⣿⣿⣿⡿⠟ ");
Serial.println (" ⠀⠉⠉⠉");
time2 = millis ();
timestamp = time2 - time1;
Serial.print ("The time taken to print is: ");
Serial.print (timestamp);
Serial.println (" milliseconds");
delay (2500); //delayed by 2.5 seconds, this is in milliseconds.
}