void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Enter a string and press enter: ");
}

void loop() {
  
  if (Serial.available() > 0) {
    char ch = Serial.read();
    String str = "";  // create an arduino string object

    while (ch != '\n') {
      if (ch >= 32 && ch <= 126) {   //check if the character is printable
        str += ch;                   //append the character to the string
      }
      if (Serial.available() > 0) {
        ch = Serial.read();  //read the next character
      }
    }

    Serial.print("Received String: ");
    Serial.println(str);
    Serial.println("Enter another string and press Enter: ");

  }
}