Instead of removing the solutions from the source, they should be encrypted with a secret key using GPG. This way tutors can share the key and the solutions can be published in repo in encrypted format. At least the ciphertext of the solutions will be version managed.
Instead of removing the solutions from the source, they should be encrypted with a secret key using GPG. This way tutors can share the key and the solutions can be published in repo in encrypted format. At least the ciphertext of the solutions will be version managed.