int numToChoose = currentEdges.size();
int randomNumber = (int) (Math.random() * numToChoose + 0);
//get a random edge
Edge randomEdge = currentEdges.get(randomNumber);
//get the destination of the random edge
currentVertex = randomEdge.getDestination();
String identifier = currentVertex.getName();
identifiers.add(identifier);
//returnVector.add(current.name);
}