void setup() {
  Serial.begin(9600);
    
      char myString[] = "Hello, Arduino!";
        int charCount = countCharacters(myString);
          
            Serial.print("The string '");
              Serial.print(myString);
                Serial.print("' has ");
                  Serial.print(charCount);
                    Serial.println(" characters.");
                    }

                    void loop() {
                      // Nothing to do here
                      }

                      int countCharacters(char* str) {
                        int count = 0;
                          while (str[count] != '\0') {
                              count++;
                                }
                                  return count;
                                  }