Complete the "main" function that will run whenever the module is called;  The main function should interact with the user and allow the user to specify whether he or she want to encrypt or decrypt; The user should be allowed to choose between 1) the insecure mode where the encryption key file is saved for usage in decryption or 2) a more secure way where the key is generated whenever it is used through a passphrase;  The user should be allowed to input the file to encrypt or decrypt; When a user input the file to encrypt, the program should identify the file extension explicitly

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Complete the "main" function that will run whenever the module is called;

 The main function should interact with the user and allow the user to specify whether he or she want to encrypt or decrypt;

The user should be allowed to choose between 1) the insecure mode where the encryption key file is saved for usage in decryption or 2) a more secure way where the key is generated whenever it is used through a passphrase;

 The user should be allowed to input the file to encrypt or decrypt;

When a user input the file to encrypt, the program should identify the file extension explicitly. That same extension should be added to the encrypted file and the decrypted file. 

- The program should be able to run from the command line interface and the python shell. Demonstrate both and submit screenshots of your demonstration.