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我正在做一个项目，该项目需要我制作一个 newNode 并按顺序分配该节点。我不确定我是否做得正确。另外，我怎样才能为这个函数做一个测试用例来测试我写的代码？

/*
Returns a new linked list node filled in with the given order, The function
 * allocates a new order and copy the values stored in data then allocate a 
 * linked list node. If you are implementing this function make sure that you
 * duplicate, as the original data may be modified by the calling function.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"

struct order 
{
        int id;
        char side;
        int quantity;
        double price;
};

struct onode 
{
        struct order* data;
        struct onode* next;
        struct onode* prev;
};

struct onode* newNode (struct order* data)
{
    struct order* dataValue  = (struct order*) malloc(sizeof(struct order));
    struct onode* linkedlist = (struct onode*) malloc(sizeof(struct onode));

    *dataValue = *data;

    linkedlist ->data = dataValue;

    linkedlist->data->id = dataValue->id;
    linkedlist->data->price = dataValue->price;
    linkedlist->data->quantity = dataValue->quantity;
    linkedlist->data->side = dataValue->side;
    linkedlist->next->prev = NULL;

    return linkedlist;

}

另外，这样有效吗？我还能改变什么来使这个程序更好？

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