Triplets :: S=('b,c|a', 'a,c|d', 'd,e|b'),
Species :: L={a,b,c,d,e}
TreeConstruct(S):
1.] Let L be the set of species in S. Build G(L) the auxillary graph.
2.] Let C1,C2....Cq be the set of connected components in G(L).
3.] If q>1,then
   - For i=1,2.....q, let S(i) be the set of triplets in S labeled by the set of leaves in C(i).
   - Let T(i) = TreeConstruct(S(i))
   - Let T be a tree formed by connecting all T(i) with the same parent node. Return T.
4.]If q=1 & C1 contains exactly one leaf,return the leaf ,else return fail.