buildTree.c

int n_chars, offset = 0;

CBinTreeNode *_buildCBinTree(CBinTreeNode *root, const char *s)
{
    char word[10];
    if (sscanf(s + offset, "%s%n", word, &n_chars))
        offset += n_chars;
    else
        return NULL;
    if (word[0] == '@')
        return NULL;

    root = createNode(word);
    root->left = _buildCBinTree(root->left, s);
    root->right = _buildCBinTree(root->right, s);
    return root;
}

CBinTree *buildCBinTree(const char *s)
{
    CBinTree *tree = (CBinTree *)malloc(sizeof(CBinTree));
    tree->root = _buildCBinTree(tree->root, s);
    return tree;
}