KirilBangachev a41a14f9d8 Add radix2 FFT (#1166)
* Add radix2 FFT

Created a dynamic implementation of the radix - 2 Fast Fourier Transform for fast polynomial multiplication.

Reference: https://en.wikipedia.org/wiki/Cooley%E2%80%93Tukey_FFT_algorithm#The_radix-2_DIT_case

* Rename radix2_FFT.py to radix2_fft.py

* Update radix2_fft printing 

Improved the printing method with f.prefix and String.join()

* __str__ method update

* Turned the tests into doctests
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The Algorithms - Python

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All algorithms implemented in Python (for education)

These implementations are for learning purposes. They may be less efficient than the implementations in the Python standard library.

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