* rename base64_cipher.py to base64_encoding.py
* edit base64_encoding.py
* import necessary modules inside doctests
* make it behave like the official implementation
* replace format with f-string where possible
* replace format with f-string
Co-authored-by: Christian Clauss <cclauss@me.com>
* fix: syntax error due to closing parenthese
* reformat code
Co-authored-by: Christian Clauss <cclauss@me.com>