Fixed Kleene Star matching

nfa.go

@@ -39,6 +39,6 @@ func verifyLastStatesHelper(state *State, visited map[*State]bool) {
 }
 
 // verifyLastStates penables the 'isLast' flag for the leaf nodes (last states)
-func verifyLastStates(start []State) {
-	verifyLastStatesHelper(&start[0], make(map[*State]bool))
+func verifyLastStates(start []*State) {
+	verifyLastStatesHelper(start[0], make(map[*State]bool))
 }