Reversing a string the good way

reverse2.c

void swap(char str[], 
   const int firstIndex, 
   const int secondIndex)
{
   char temp = str[firstIndex];
   str[firstIndex] = str[secondIndex];
   str[secondIndex] = temp;
}

void reverse2(char src[])
{
   //start at beginning and end
   int firstIndex = 0;
   int secondIndex = strlen(src) - 1;

   while (secondIndex > firstIndex)
   {
      swap(src, firstIndex, secondIndex);
      //move indices inward
      ++firstIndex;
      --secondIndex;
   }
   
   printf("reverse2: %s\n", src);
}