[C++ Help] I'm trying to conversion by using vector and string but when loop back it error

Question

Expected:
First Middle Last name -> Last, First M-initial.
james herBErt BonD > Bond, James H.

Troubleshooting:
People without middle name? They only input 2 strings, First name, Last name > Enter.

Code:
#include <iostream>
#include <string>
#include <new>
using namespace std;
// ======================================================================
// Function: capitalize
// Purpose: Return str capitalized, non-letters are ignored and kept the same
// Examples: abc -> Abc, aBC -> Abc, a. -> A.
// Parameters:
// str - input string
// ======================================================================
void capitalize(string& str);

int main() {
int NAME_COUNT = 3; //FIRST MIDDLE LAST
int i;
string word;
string* p;
char answer = ' ';
do {
p = new (nothrow) string[NAME_COUNT];
if (p == nullptr)
cout << "Error: memory could not be allocated";
else
{
cout << "Enter first name, middle name, last name? ";
cin >> p[0] >> p[1] >> p[2]; //SOMETIME PEOPLE DON'T HAVE MIDDLE NAME

//IF p[2] EMPTY >> ????

swap(p[0], p[2]); //swap value
swap(p[1], p[2]); //swap value
p[0] = p[0] + ","; //add ','
p[2].erase(p[2].begin() + 1, p[2].end()); //conver Initial
p[2] = p[2] + "."; //add Ini.

cout << "You have entered: ";
for (i = 0; i < NAME_COUNT; i++) {
capitalize(p[i]);
cout << p[i] << " ";
}
delete[] p;
cout << "Wanna do again? (Y/N) ";
cin >> answer;
}
} while (answer != 'N' && answer != 'n');
return 0;
cout << "Exit. End of the program." << endl;
}

void capitalize(string& str) {
if (str.length() == 0) {
return;
}
str[0] = toupper(str[0]);
for (int i = 1; i < str.length(); i++) {
str[i] = tolower(str[i]);
}
}

Answer 1

http://cpp.sh/92duc

Answer 2

im using array, string now