#define BUF_SIZE 1200

char buf[BUF_SIZE] = {0};
char inChar;
bool stringComplete = false;
int i = 0;

void setup() {
  Serial.begin(9600);       // For Wokwi and "physical" ESP32
  // Serial.begin(115200);  // * NOT for Wokwi, only for "physical" ESP32 *
  Serial.println("Please input");
}

void loop()
{
  while (Serial.available())
  {
    inChar = (char) Serial.read();

    if (inChar == '\n')
    {
      buf[i++] = inChar;
      buf[i] = 0;
      stringComplete = true;
    }
    else
    {
      buf[i++] = inChar;
    }
  }

  if (stringComplete)
  {
    Serial.print(buf);

    stringComplete = false;
    i = 0;
  }
}