printf("Enter a number to search: ");
    scanf("%d", &num);
    if (search(root, num) != NULL) {
        printf("YESn");
    }
    else {
        printf("NOn");
    }

BST* search(BST* root, int value) {
    if( root == NULL) {
        return NULL;
    }
    else if(value < root->value) {
        root->left = search(root->left, value);
    }
    else if(value > root->value) {
        root->right = search(root->right, value);
    }
    return root;
}