Two Stepperclose to one Arduino close - two stepper motor with 1 arduino (externally powered for smooth working of motor)

I'm trying to move my motors to a reference point with respect to the loaded image. I'm using 1 arduino, adafruit motor shield and two stepper motors. I modified the stepper motor example provided by LIFA to work with two motors but I'm not able to close my stepper motor to a single arduino close. Tried using a 'bundle by name' from cluster module, din't work. I have attached my code. please help. thanks in advance I'm looking forward to completing this with all of your help so that This would help all who have been asking for a two stepper motor control.