单向链表逆转方法

struct data{
    data *next;
    int m_val;
};

data* reverse(data *head){
    data *new_chain == NULL;
    data *temp = NULL;
    while(head != NULL){
        temp = (data*)malloc(sizeof(data));
        //copy resource
        temp->m_val = head->m_val;

        if(new_chain == NULL){
             new_chain = temp;  
        }else{
             temp->next=new_chain;
             new_chain = temp;
        }
　　　　head = head->next;
   }
    return new_chain;
}