what is wrong in rightrotate and leftrotate in my code for avltree?

node* rightrotate(struct node *y)
{
    struct node *x = y->left;
    struct node *z = x->right;

    x->right = y;
    y->left = z;

    y->h = max(h(y->left), h(y->right))+1;
    x->h = max(h(x->left), h(x->right))+1;

    return x;
}
node* leftrotate(struct node *x)
{
    struct node *y = x->right;
    struct node *z = y->left;

    y->left = x;
    x->right = z;

    y->h = max(h(y->left), h(y->right))+1;
    x->h = max(h(x->left), h(x->right))+1;

    return y;
}