URGENT! i need to develop a C-codes using dev c++. here are my flowchart and question related and solution

Most of smartphones nowadays are come with full touch screen, the only button that they have are power and volume button. The major problems of these smartphones are not only their fragile phone screen that can easily cracked, their power button can also cause problems. After several years of using it, the button can be stuck and broken if we were press it too hard, or the button can simply missing or fell out from its socket. It might take some time for user to fix it. So, how to turn on the smartphones screen at the present situation?

Thus, the solution to this problem is, a gesture-based features sensor such as fingerprint scanner can be very helpful to turn on the screen. So, the idea is that we can change the power button method to use only our fingerprint sensor. The security system may more secured since it only scans your fingerprint. It will auto block your phone after three attempts if there are any strangers try to hijack. Also, it is cheaper this way, because we do not often go and buy or fix new power button.

Start Set fingerprint of user Power of smartphone Enter fingerprint Yes Is fingerprint match? Unlock phone No 1 Re-enter fingerprint Yes Is fingerprint match? Unlock phone No 1 Re-enter fingerprint Yes Is fingerprint match? Unlock phone No Block phone Stop