void reverse (char* str) {
    char* newStr = (char*)malloc(sizeof(str));

    for (int i=0;i<sizeof(str)/sizeof(char);i++) {
       int index = sizeof(str)/sizeof(char)-1-i;
       newStr [i] = str [index];
    }
}

void reverse (char* str) {
   size_t len = strlen(str);
   char* newStr = (char*)malloc(len + 1);

   for (int i=0; i<len;i++) {
      int index = len-1-i;
      newStr[i] = str[index];
   }
   newStr[len] = ''; // Add terminator to the new string.
}

std::string reverse(std::string str) {
  for (std::string::size_type i = 0, j = str.size(); i+1 < j--; ++i) {
    char const swap = str[i];
    str[i] = str[j];
    str[j] = swap;
  }
  return str;
}

void reverse(char (&str)[10]);