Merkle Tree Construction Issue about blockchain_go HOT 2 OPEN

// NewMerkleTree creates a new Merkle tree from a sequence of data
func NewMerkleTree(data [][]byte) *MerkleTree {
	var nodes []MerkleNode

	if len(data)%2 != 0 {
		data = append(data, data[len(data)-1])
	}

	for _, datum := range data {
		node := NewMerkleNode(nil, nil, datum)
		nodes = append(nodes, *node)
	}

	for i := 0; i < len(data)/2; i++ {
		var newLevel []MerkleNode

		for j := 0; j < len(nodes); j += 2 {
			node := NewMerkleNode(&nodes[j], &nodes[j+1], nil)
			newLevel = append(newLevel, *node)
		}

		nodes = newLevel

		if len(newLevel) == 1 {
			break
		}
	}

	mTree := MerkleTree{&nodes[0]}

	return &mTree
}