cannot declare void

PlatformIO IDE
1 
void loop() {
  if (HC06.available()) {
    char command = HC06.read();
    Serial.println(command);
    switch (command) {
      case 'F': 
        moveForward();
        break;
      case 'B': 
        moveBackward();
        break;
      case 'L': 
        turnLeft();
        break;
      case 'R': 
        turnRight();
        break;
      case 'S': 
        StopMotors();
        break;
    }
  }
}

void moveForward() {
  Serial.println("Moving forward");
  
  analogWrite(motor1_INL, 255);
  analogWrite(motor1_INR, 0);
  analogWrite(motor2_INL, 255);
  analogWrite(motor2_INR, 0);
  analogWrite(motor3_INL, 255);
  analogWrite(motor3_INR, 0);
  analogWrite(motor4_INL, 255);
  analogWrite(motor4_INR, 0);
}

void moveBackward() {
  Serial.println("Moving backward");

  analogWrite(motor1_INL, 0);
  analogWrite(motor1_INR, 255);
  analogWrite(motor2_INL, 0);
  analogWrite(motor2_INR, 255);
  analogWrite(motor3_INL, 0);
  analogWrite(motor3_INR, 255);
  analogWrite(motor4_INL, 0);
  analogWrite(motor4_INR, 255);
}

void turnLeft() {
  Serial.println("Turning left");

  analogWrite(motor1_INL, 255);
  analogWrite(motor1_INR, 0);
  analogWrite(motor3_INL, 255);
  analogWrite(motor3_INR, 0);
  analogWrite(motor2_INL, 0);
  analogWrite(motor2_INR, 255);
  analogWrite(motor4_INL, 0);
  analogWrite(motor4_INR, 255);
}

void turnRight() {
  Serial.println("Turning right");

  analogWrite(motor1_INL, 0);
  analogWrite(motor1_INR, 255);
  analogWrite(motor3_INL, 0);
  analogWrite(motor3_INR, 255);
  analogWrite(motor2_INL, 255);
  analogWrite(motor2_INR, 0);
  analogWrite(motor4_INL, 255);
  analogWrite(motor4_INR, 0);
}

void StopMotors() {
  //Serial.println("Stopping motors");

  analogWrite(motor1_INL, 0);
  analogWrite(motor1_INR, 0);
  analogWrite(motor2_INL, 0);
  analogWrite(motor2_INR, 0);
  analogWrite(motor3_INL, 0);
  analogWrite(motor3_INR, 0);
  analogWrite(motor4_INL, 0);
  analogWrite(motor4_INR, 0);
}
2

Remember to do a forward declaration of all your functions before setup.

void moveForward();
void moveBackward();
void turnLeft();
void turnRight();
void StopMotors();

void setup(){.......
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