Returning different parts of a char array arduino

Question

I asked a question here about my issue and thanks to @enhzflep I solved the huge part of my problem. My problem was if I write 46754!ABCDEFG12345#qwerwe to the serial, I want to

Answer 1

I can't test any code myself, but I think this should work. Change the allocation of command to 200 bytes. Your commented out code seemed mostly correct. I just made some minor changes:

if(Index>=2){
    command[Index-2] = received;
    Index++;
    Serial.print(received);
}