Программа с $ и его заменой на длину файла

#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <stdbool.h>
 
char _itoa(int count, char *str);
 
char _itoa(int count, char *str)
{
for (int i = count; i >= 10; i /= 10)
str++; // go to end of str for record
for (; count > 0;)
{
*str = count % 10 + '0';
str--;
count /= 10;
}
return *str;
}
 
void ListOfFiles(const char *name)
{
const char symbol = '$';
 
DIR *dir;
struct dirent *dirent;
 
if ((dir = opendir(name)) != NULL)
{
while ((dirent = readdir(dir)) != NULL)
{
if (dirent->d_type == DT_REG)
{
char bufferNewName[256] = "dir/";
char currentName[256] = "dir/";
char emptyArr[256] = {0};
char *bufferOfEndStr = dirent->d_name;
char *lenghtStr = emptyArr;
int symbolPlace = -1;
int lenght = strlen(dirent->d_name);
for (int i = 0; symbolPlace == -1 && i < lenght; i++)
{
if (dirent->d_name[i] == symbol)
symbolPlace = i;
bufferOfEndStr++;
};
if (symbolPlace != -1)
{
_itoa(lenght, lenghtStr); // get string length
strcat(currentName, dirent->d_name); // <dir name>/<file name>
strncat(bufferNewName, dirent->d_name, symbolPlace); // <dir name>/<file name without $>
strcat(bufferNewName, lenghtStr); // <dir name>/<file name with lenght>
strcat(bufferNewName, bufferOfEndStr); // <dir name>/<file name with lenght + file name ending>
rename(currentName, bufferNewName);
memset(bufferOfEndStr, 0, sizeof(bufferOfEndStr));
memset(bufferNewName, 0, sizeof(bufferNewName));
}
}
}
if (closedir(dir) == -1)
perror("close dir");
}
else
perror("open dir");
}
 
int main()
{
ListOfFiles("dir");
return 0;
}