First Nif test
Refactor test
Empty nif to string
TO string Nif based on Dni
Check Nifs with incorrect length
FIrst checksum
Refactor Nif clas
Code calculations are too complex, so I'm moving the logic to new classes
Fill code with trailing zeros
Refactor
More short code tests
Codes must have numbers only
Improve tests
Test checksum calculation
First test for NieCode
Test Nie letter
Test short codes
Codes must have numbers only
Remove unnecessary code
Refactor classes