char buffer[20];
char maison[10] = "maison";
char copy[10];
char letter = 48;
char index = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  memset(buffer, 255, 0);
  index = 2;
  Serial.print("Maison: |");Serial.print(maison);Serial.print("|, index: ");Serial.println(maison[index]);
  strcpy(copy, maison+index);
  Serial.print("copy: |");Serial.println(copy);
  maison[index] = 't';
  strcpy(maison+index+1, copy);
  Serial.print("Maison: |");Serial.print(maison);Serial.print("|, index: ");Serial.println(maison[index]);
  index = 0;
}

void loop() {
  if (index == 10) return;
  buffer[index] = letter;
  letter ++;
  index ++;
  Serial.print("Buffer: |");Serial.print(buffer);Serial.print("|, taille: ");Serial.print(strlen(buffer));Serial.print(", End: ");Serial.println(buffer[strlen(buffer)-1]);
  delay(1000);
}