Increment Files with SD

Using Arduino Storage
4

I have a similar requirement but took a different approach.
I start with a file name (w/o extension) of 100,
I add the extension .cvs
I look to see if the file 100.cvs exists
If it does I increment 100 then look for 101.cvs etc

my code is:

  do
    {
     itoa(gFileNumb, gDataFile, 10);  // (value, Array, base)
     const char *extension = ".csv";
     strcat(gDataFile, extension);  // syntax:  strcat(dest, source)
     ++gFileNumb;
    } while (SD.exists(gDataFile));  // assume will Rtn false if  no communication.