Migrate cta-fst-gcd to python3
The scripts cta-fst-gcd.py and test_cta-fst-gcd.py are written in python2. We must migrate them to python3.
Edited by Julien Leduc
The scripts cta-fst-gcd.py and test_cta-fst-gcd.py are written in python2. We must migrate them to python3.