02-实际处理数据遇到的问题

/*
  将某个文件夹中的全部文件, 按以下两条规定重命名. 
    一. 如果文件名中含有'_'且'_'到'.'之间只有一位数, 在这位数前面加'0'
    二. 如果文件名中不含'_'且'.'前面只有一位数, 在这位数前面加'0'

 程序目前存在无法解释的bug, 当pAddress的路径和old, 相同时文件名无法替换.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* pAddress = "F:\\149110\\";
char fileAddress[100];

void deleteChangeLine(char arr[100]);
void chackFileName(char fileName[50]);
void renameFunc1(char fileName[50]);
void renameFunc2(char fileName[50]);

int main()
{

    char* mAddress = "G:\\dir.txt";

    FILE* mFile = fopen(mAddress, "r");
    char fileName[50];

    system("dir F:\\149110\\ /b > G:\\dir.txt");

    //使用文本中的名字找到对应的文件
    while (fgets(fileName, 50, mFile) != NULL)
    {
        strcpy(fileAddress, pAddress);
        strcat(fileAddress, fileName);
        deleteChangeLine(fileAddress);
        //printf("%s", fileAddress); //文件完整路径
        FILE* findFile = fopen(fileAddress, "r");
        if (findFile == NULL) {
            printf("find file fail!");
        }
        //printf("secceseful find file!");  //成功找到文件
        //检测文件名是否合法, 如果不合法就修改.
        chackFileName(fileName);

    }

    return 0;
}

void deleteChangeLine(char fileAddress[100])
{
    for (int i = 0; i < 100; i++)
    {
        if (fileAddress[i] == '\n')
        {
            fileAddress[i] = '\0';
        }
    }
}

void chackFileName(char fileName[50])
{
    char fileNameCopy[50] = { 0 };
    strcpy(fileNameCopy, fileName);

    for (int i = 0; i < 50; i++)
    {
        if (fileNameCopy[i] == '_')
        {
            renameFunc2(fileName);
        }
        if (i == 49)
        {
            renameFunc2(fileName);
        }
    }
}

void renameFunc1(char fileName[50])
{
    char newName[50] = { 0 };
    char newFileAddress[100] = { 0 };
    char old[40] = "D:\\13770\\137_1.bmp";
    char new[40] = "D:\\13770\\137_01.bmp";


    int j = 0;

    for (int i = 0; i < 50; i++)
    {

        if (fileName[i] == '_')
        {
            newName[j] = fileName[i];

            if (fileName[i + 2] == '.')
            {
                j++;
                newName[j] = '0';
            }

        }
        else
        {
            newName[j] = fileName[i];
        }
        j++;
    }

    strcpy(newFileAddress, pAddress);
    strcat(newFileAddress, newName);
    deleteChangeLine(newFileAddress);

    //printf("%s  ---  %s \n", fileAddress, newFileAddress);

    int result = rename(old, new);
    printf("%d", result);
}

void renameFunc2(char fileName[50])
{
    char old[40] = "F:\\149110\\01.bmp";
    char new[40] = "F:\\149110\\1.bmp";
    char newName[50] = { 0 };
    char newFileAddress[100] = { 0 };
    int j = 0;

    for (int i = 0; i < 50; i++)
    {
        if (i == 0)
        {
            if (fileName[i + 2] == '.') {
                newName[j] = '0';
            }

            j++;
        }

        newName[j] = fileName[i];
        j++;
    }

    strcpy(newFileAddress, pAddress);
    strcat(newFileAddress, newName);
    deleteChangeLine(newFileAddress);

    rename(old, new);
}