Segmentation fault with small graph

[gustavolgcr]

I tried to create a super small graph to test the implementation but I got a Segmentation fault after the ./vtree_build test.vedge test.vtree

Graph:

2 2
0 1 10
1 0 10

Erro:

begin read
correct1
2 2
correct2
correct3
correct4
malloc!
Segmentation fault