Pointer, string cu const char * referinta

#include <iostream>
#include <conio.h>

using namespace std;
void exchange(const char*& p1, const char*& p2) {
    p1 = p2;
}
void wow(const char*& p) {
    char ceva[256] = "";
    strcpy_s(ceva, "hahalero");
    char* p2 = ( char*)malloc(sizeof( char) * 255);
    int i = 0;
    for (const char *p = ceva; *p != '\0'; ++p) {
        *(p2 + i++) = *(p);
    }
    p2[i] = '\0';
    exchange(p, p2);

}

void main() {
    int x = 5;
    const char* p;// = (const char*)malloc(sizeof(const char) * 255);
    wow(p);
    cout << p;
}