#include <Arduino.h>

//String_class_h

//using namespace std;

struct d
{
  String S; // Strings  - Complete parsed Strings
  String P; // Parsed   - Exta storage just in case
  int I;    // Index    - Stores the index location of the delimiter
  int L;    // Length   -
};

struct d p[10] = {};

bool ReadingSerial = false;

void ReadSerial() {
  String uI;
  int length;
  int pos;  

//CHECK IF SERIAL IS AVAILABLE
  if(Serial.available() > 0) {
    uI = Serial.readStringUntil('\n');
    ReadingSerial = false;
  }

//FIND THE LENGTH(NUMBER OF CHARACTERS)
  length = uI.length();
  printf("Input length = %i\n", length);  
//Add a terminating character to the end of the string
  uI[length] = '\n';
  printf("User Input = %s\n", uI.c_str());
  

//Finding a character or Substring
  p[1].I = uI.indexOf(" ");
  printf("Index of first delimiter: %i\n", p[1].I);
  strncpy(&p[1].S[0], &uI[0], 3);
  printf("SubString = %s\n", p[1].S.c_str());
  Serial.println(p[1].S);
  
  //String sub = uI.substring(d + 1);
  //printf("SubString = %s\n", sub.c_str());
  
 }

void setup() {
  Serial.setTimeout(2000);
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S3!");
}

void loop() {

if(Serial.available() > 0) {
  ReadingSerial = true;
  ReadSerial();
}
  delay(10); // this speeds up the simulation
}