Help to identify Black Snake from Guinea

[daawuuda]

Dear users,

I'm doing some volunteer work in Guinea (Fouta Djallon) and I've found this snake inside the garage near the gate.

As I don't have experience with snakes and I'm aware that there are some very dangerous species here, I had to kill her.

The snake was very aggressive when I was trying to hit her with a very long stick, she attacked the stick multiple times.

As I'm sure that there are more snakes like this near the house, I would like to know which snake it is and how to handle it without the need to kill.
People here don't know their names.

I hope that the pictures here will help someone to identify it.

Thank you very much.

Best regards,
David