I think i found why I had issues …
I remembered that the software SNAP don’t like where the path to a file is too long (with too many subfolders). So i just changed the folder where we can find my image L1C to a folder closer to se base of my hard drive. And it finally work, no more issues with Sen2Cor 2.5.5, the command line is working and i can implement it my python script to do the processing on multiples images. I didn’t try with sen2cor 2.8 but as it work with the other version i don’t need it.
Well thank you for your help anyway, and I hope that this information about folders will be usefull.