c语言批量修改文件名

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


int scandir(void){
	char path[200]="D:\\test";
	char pathcpy[100];
	char substr[100]="第"; //该字符串前的文字都去掉 
	char* new_filename;
	char new_filepath[100];
	int res;
	
//	puts("请输入要查询的路径（不超过200字符）");
//	scanf("%200s",path);

	strcat(path,"/");
	size_t path_len = strlen(path); 
	strcpy(new_filepath,path);

    struct _finddata_t fa;
    long handle;
    if((handle = _findfirst(strcat(path,"*"),&fa)) == -1L){
    	printf("The Path %s is wrong!\n",path);
        return 0;
	}
	int i=0;
	int y;
	
	while(_findnext(handle,&fa)==0){
		if(!strcmp(fa.name,".")||!strcmp(fa.name,".."))continue;
		new_filename=strstr(fa.name,substr);
		if(!new_filename)continue;//如果找不到返回null 后面用strcpy就会出错 

		strcpy(path+path_len,fa.name);
		strcpy(new_filepath+path_len,new_filename);
		
		printf("%d:%s>>>>%s\n",++i,fa.name,new_filename);
		
		res=rename(path,new_filepath);
		if (res)puts("文件重命名失败！"); 

	}
    _findclose(handle);
    
    return 0;    
}
 
int main(void)
{
    scandir();
    return 0;    
}