c语言文件读写操作 去掉文件每行的前六个字符

#include <stdio.h>
#include <stdlib.h>
#define MAXLINE 150

void cross_read_line(char * file1, char * file2, char * mode);

int main(int argc,char *argv[])
{
    cross_read_line(argv[1], argv[2], "rw");

    return 0;
}

/* 以行为单位，交替输出两文件(按行)内容 */
void cross_read_line(char * file1, char * file2)
{
        FILE * fp1, * fp2;
        char line1[MAXLINE];

        if ((fp1 = fopen(file1,"rb")) == NULL){
                fprintf(stderr,"Can't open %s/n",file1);
                exit(1);
        }
        if ((fp2 = fopen(file2,"ab")) == NULL){
                fprintf(stderr,"Can't open %s/n",file2);
                exit(1);
        }
        while (fgets(line1,MAXLINE,fp1) != NULL)
        {
                fputs(line1 + 6,fp2);
        }
        fclose(fp1);
        fclose(fp2);
}