在C语言中将文本文件转换为单链表时,每次插入时头部都会更新

如问题所述,我想将文本文件转换为链表。当我从数组中读取字符串元素时,它工作得很好,但在从文件中执行相同操作时,会产生更新头的问题。以下是我尝试过的。。。

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

//creating structure
typedef struct node {
    char *word;
    struct node *next;
}node;

//function for creating a node
node *createnode(char *wrd){
    node *temp1;
    temp1 = (node*)malloc(sizeof(node));
    temp1->word = wrd;
    temp1->next = NULL;
    return temp1;
}

//function for creating and adding new node to linked list
node *creat(node *head, char *wrd){
    node *temp, *p;
    temp = createnode(wrd);
    if(head == NULL){
        head = temp;
    }else{
        p = head;
        while(p->next != NULL){
            p = p->next;
        }
        p->next = temp;

        printf("p->word from creat method: %s ADDR: %p HEAD: %s \n", p->word, 
        p->next,head->word);
    }
    return head;
}

//traverse the list and display each node
node *show(node *head){
    node *p;
    p=head;
    while(p != NULL){
        printf("from show method: %s", p->word);
        p = p->next;
        printf("\n");
    }
    printf("\n");
}


int main()
{
     node *head = NULL;
     /* Character array to read the content of file */
     char sWord[20];
     /* Pointer to the file */
     FILE *fp;

     /* Opening a file in r mode*/
     fp= fopen ("hw10data.txt", "r");

     while( fscanf(fp, "%s", sWord) != EOF )
        {
        head = creat(head, sWord); //create list
        }
     fclose(fp);

     show(head);
     return 0;
}

我不知道为什么每次插入时头部都在更新。任何帮助都将不胜感激。