char buffer[512];
char smallbuffer[2];
String s = "FB FG JH FH SD ff gf"
void setup() {
  Serial.begin(115200);
  for (int i =0; i< 20; i++)
  {
      sprintf(smallbuffer, "%2c ", test_mass[i]);
  }
  Serial.println(smallbuffer);
}

void loop() {
  // put your main code here, to run repeatedly:

}