Voice Controlled LEDs using Arduino and Bluetooth (Problem)

Hello any one here, can help me find out what is the problem with HC 06 bluetooth module. I am currently developing a voice controlled LED using Arduino and Bluetooth  for my project. I used this sample to develop my project https://circuitdigest.com/microcontroller-projects/arduino-based-voice-… but then the codes are not working. And I try another options to fix my problems, if the bluetooth module, the codes i used, and mobile application are having the error. I used to configure my bluetooth module using AT commands but nothing happens and no responses appear. I checked all the connections I made and it seems like ok and correct base on the sample. What i am struggling about is how to know if the bluetooth module is really working and communicating properly.

I used this code to configure my bluetooth and make some AT commands but it doesn't work.

#include <SoftwareSerial.h>
SoftwareSerial mySerial(0, 1); // RX, TX

String command = ""; // Stores response of the HC-06 Bluetooth device

void setup() {
  // Open serial communications:
  Serial.begin(9600);
  Serial.println("Type AT commands!");
  
  // The HC-06 defaults to 9600 according to the datasheet.
  mySerial.begin(9600);
}

void loop() {
  // Read device output if available.
  if (mySerial.available()) {
    while(mySerial.available()) { // While there is more to be read, keep reading.
      command += (char)mySerial.read();
    }
    
    Serial.println(command);
    command = ""; // No repeats
  }
  
  // Read user input if available.
  if (Serial.available()){
    delay(10); // The delay is necessary to get this working!
    mySerial.write(Serial.read());
  }
}

Do you think that my bluetooth module has the problem and defective? and there is any idea to test my module physically if it is communicating or not.

Thank you for the help in advance.