Programming Bitcoin book, Jimmy Song. Chapter 1 ecc.py functions aren't recognized even though the ecc.py (the source file of the functions) is in the same folder as the file in which the Functions are being called
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The functions are written:
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I start the Jupyter notebook every time by typing these commands in the command prompt
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and keep the command prompt running

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as I said, These files are in the same folder
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The installation guide to Jupyter Notebook:
https://www.oreilly.com/library/view/programming-bitcoin/9781492031482/preface01.html#setting_up
The book's github:
https://github.com/jimmysong/programmingbitcoin

The steps to installation and starting the Jupyter Notebook I got from that guide

The question is:
What seems to be the problem here?