C Coding or correcting a program

This was the task and the wirtten code is below. I need someone who can correct the code so that the points in the task are fullfilled: Topic: PIN encryption Description: We intend to create an encryption for a safe. For this purpose we want to use a hardware use, on which we can enter a PIN using buttons. With these buttons we can open or close the save. Here you have three attempts for the correct input. If all three attempts were worng, there is a possibility to unlock the safe using master code. Changing the PIN (new PIN) is possible without big change of the program. To enter the PINs we have three buttons and a button for confirmation. In total 4 buttons. Each button can be pressed four times. If a button was pressed four times the program will start again from the beginning. The three PIN buttons must be pressed in sequence. If the specified code is correct, a green light on the hardware (means a lamp) will light up. If the PIN was incorrect, so another indicator lamp will light up red. If the PIN is entered incorrectly three times, so the red light will blink continuously and an alarm is triggered. Now you can use the Master code to open the safe and stop the alarm. The master code can not be changed and is defined only once. It is sufficient to enter the same code again and confirm to close the safe again. What is needed: - Hardware - Two light - 4 buttons - Alarm System I attached the code I have written.