int actualFirst=0;
int actualLast=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hi");
}

void loop() {
  // put your main code here, to run repeatedly:
  while(Serial.available()==0){}

  String input = Serial.readString();
  input.trim();

  String first="";
  first.concat(input.charAt(0));
  first.concat(input.charAt(1));
  actualFirst = first.toInt();

  String last="";
  last.concat(input.charAt(3));
  last.concat(input.charAt(4));
  actualLast = last.toInt();

  Serial.print("System set to convert from base ");
  Serial.print(actualFirst);
  Serial.print(" to base ");
  Serial.print(actualLast);

  Serial.end();
  Serial.begin(9600);

  while(Serial.available()==0){}
  input = Serial.readString();

  int counter = 0;
  String currentNum = "";
  while(true){
    if(input.charAt(counter)=='\0'){break;}
    currentNum.concat(input.charAt(counter));
    counter++;
  }
  String num = currentNum;
  Serial.println("");
  Serial.println(num);
  int actualNum = num.toInt();

  doMath(actualFirst,actualLast,actualNum);

  Serial.end();
  Serial.begin(9600);
}

int doMath(int baseOne, int baseTwo, int numper){
  return makeNumberGood(baseOne,numper);
}

int makeNumberGood(int base, int number){
  //return 7;
  Serial.println(determineLength(number));
}

int determineLength(int nummber){
  int length = 0;
  String tempNum = String(nummber);
  tempNum.trim();
  for(int i=0;i<100;i++){
    if(tempNum.charAt(i)=='\0'){break;}

    else if(tempNum.charAt(i)==' '){}

    else{
      length++;
      Serial.print("Char an Stelle ");
      Serial.print(i);
      Serial.print(" ist ");
      Serial.print(tempNum.charAt(i));
      Serial.println(" und es wurde erhöht");
    }
  }
  return length;
}