problema em projeto de PAP

[rikardo6974]

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Servo.h>
Adafruit_SSD1306 display = Adafruit_SSD1306 ();
const int tringPinMe = 48;
const int echoPinMe = 49;
const int tringPinMs = 50;
const int echoPinMs = 51;
const int tringPin1 = 24;
const int echoPin1 = 25;
const int tringPin2 =26;
const int echoPin2 = 27;
const int tringPin3 = 28;
const int echoPin3 = 29;
long durationMe;  
int distanceMe;
long durationMs;
int distanceMs;
String 11 = "";
String 12 = "";
String 13 = "";
const int pinoServo = 5;
int pos=130;
Servo s;
void setup() {
    wire.begin ();
    display.begin (SSD1306_SWITCHCAPVCC, 0x3C);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.clearDisplay();
    pinMode(tringPinMe, OUTPUT);
    pinMode(echoPinMe, INPUT);
    pinMode(tringPinMs, OUTPUT);
    pinMode(echoPinMs, INPUT);
    pinMode(tringPin1, OUTPUT);
    pinMode(echoPin1, INPUT);
    pinMode(tringPin2, OUTPUT);
    pinMode(echoPin2, INPUT);
    pinMode(tringPin3, OUTPUT);
    pinMode(echoPin3, INPUT);
    Serial.begin (9600);
    a.attach(pinoServo);
    a,write(80);
}
void loop()
{
    display.print ("Lugar 1:"+(11));
    display.display();
    display.setCursor(0,10);
    display.print("Lugar 3:"+(13));
    display.display();

    display.setCursor(0,20);
    display.clearDisplay();
    digitalWrite(tringPinMe, LOW);
    delayMicroseconds(2);
    digitalWrite(tringPinMe, HIGH);
    delayWrite(tringPinMe, LOW);
    durationMe = pulseIn(echoPinMe, HIGH);
    distanceMe= durationMe*0.034/2;
    if(distanceMe<=5) {
        s.write(0);
    }
    else
    {
        delay(2000);
        s.write(80);
    }
    digitalWrite(tringPinMs, LOW);
    delayMicroseconds(2);
    digitalWrite(tringPinMs, HIGH);
    delayMicroseconds(10);
    digitalWrite(tringPinMs; LOW);
    durationMs = pulseIn(echoPinMs, HIGH);
    distanceMs= durationMs*0.034/2;
    
    if(distanceMs <=5) {
        s.write(0);
    }
        else
    {
        delay(3000);
        s.write(80);
    }
     11=testarOcupado(int tringPin1, echoPin1);
     12=testarOcupado(int tringPin2, echoPin2);
     13=testarOcupado(int tringPin3, echoPin3);
    }
    String testarOcupado(int tringPin, int echoPin){
        long duration;
        int distance;
        digitalWrite(tringPin, LOW);
        delayMicroseconds(5);
        digitalWrite(tringPin, HIGH);
        delayMicroseconds(10);
        digitalWrite(tringPin, LOW);
        duration = pulseIn(echoPin, HIGH);
        distance= duration*0.034/2;
        Serial.print("Distance: ");
        Serial.println(distance);
        if(distance>8) {
            return "Livre";
        }
    else {
        return "Ocupado";
    }
}

agradeceria imenso a quem me conseguisse ajudar pois não tou a conseguir resolver este erro
obrigado.