一段字符换位置

#include <stdio.h>
#include <string.h>
#define FILENAME "/Users/ccj/Desktop/stu.txt"
void test()
{
    FILE *fp=fopen("/Users/ccj/Desktop/stu.txt", "w");
    fputs("111;xx1;xx1@qq.com\n", fp);
    fputs("112;xx2;xx2@qq.com\n", fp);
    fputs("113;xx3;xx3@qq.com\n", fp);
    fclose(fp);
}
/*
 1.将信息读取到内存
 2.去掉\n
 3.分割字符串
 4.交换字符串
 5.写文件
 */

void mySplit(char *str,char ch,char *pre,char *next)
{
    while (*str!=ch)
    {
        *pre=*str;
        str++;
        pre++;
    }
    *pre='\0';
    
    str++;//移到;后面
    while(*str!='\0')
    {
        *next=*str;
        next++;
        str++;
    }
    *next='\0';
}



void swapString(char *str)
{
    char others[20];
    char string1[20],string2[20],string3[20];
    mySplit(str, ';', string1, others);
    mySplit(others, ';', string2, string3);

    strcpy(str, string2);
    strcat(str, ";");
    strcat(str, string3);
    strcat(str, ";");
    strcat(str, string1);
    strcat(str, "\n");
//    printf("拼接好的str=%s\n",str);
}

void removeEnter(char text[][100],int index)
{
    int i=0;
    for (; i<index; i++)
    {
        long last=strlen(text[i]);
        if(text[i][last-1]=='\n')
        {
            text[i][last-1]='\0';
        }
    }

}

int getText(char text[20][100])
{

    int index=0;
    char str[100];
    FILE *fp=fopen(FILENAME, "r");
    while (fgets(str, 100, fp))
    {
        strcpy(text[index], str);
        index++;
    }
    
    fclose(fp);
    
    return index;
}

void  writeText(char text[][100],int index)
{
    FILE *fp=fopen(FILENAME, "w");
    int i=0;
    for (; i<index; i++)
    {
        fputs(text[i], fp);
    }
    fclose(fp);
}

int main()
{
    
    char text[20][100];
    int index=getText(text);
    
    removeEnter(text,index);

    int i=0;
    for (i=0; i<index; i++)
    {
        swapString(text[i]);
    }
    
    writeText(text,index);
    
    
    return 0;
}