remove generator and concurrent/parallel code
add balance to credit card
Revert "add balance to credit card"

This reverts commit ffe5d97a0f050625aa1a951fbd9a156c8d3e78ca.
Revert "Revert "add balance to credit card""

This reverts commit 5fdeab9dbc6a48c181144bc54fc2f05d3ff873d1.
ajout du compteur de valid/invalide
fix issue with checksum generator and validator
Merge branch 'session1'
max avec l'executor
add blocking queue implementation