Untitled

const int numberOfStations = 3;
char inputLine[64];
int currentPosition = 0;
int reading = false;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  while(Serial.available()){
    char letter = Serial.read();
    if (letter == 'S'){
      currentPosition = 0;
      inputLine[currentPosition++] = letter;
      reading = true;
    }
    else if(reading){
      if(letter == 'X'){
        inputLine[currentPosition] = letter;
        reading = false;
        for(int i = 0; i <= currentPosition; i++){
          Serial.print(inputLine[i]);
        }
        Serial.println();
      }
      else inputLine[currentPosition++] = letter;
    }
  }
  
}