Function leave_room_handler 

async fn leave_room_handler(
    __arg0: State<ServerState>,
    __arg1: AuthenticatedClientRequest<Request>,
) -> Result<ArminiusResponse<Response>, AddRoomMemberEventError>

Handler for POST /_matrix/client/v3/rooms/{roomId}/leave (See https://spec.matrix.org/v1.14/client-server-api/#post_matrixclientv3roomsroomidleave).

Endpoint used to leave a room.