Vigenere Cipher decryption unknown key, JAVA Programming

Assignment Help:

I need help writing this code either in java or in python.
basically the steps are described here in this youtube video
https://www.youtube.com/watch?v=LaWp_Kq0cKs
or this is also described in these 2 pages of the book see attached
Attached is also the example cipherText to decode

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