Нужно ли очищать char * old value как?

#include <iostream>
#include <string>
#include <stdio.h>
 
 
int main()
{
     long adr=1;
 char * str1, *str2;
 
 
str1 = "Hello1";
printf ("&str1 = %d ",&str1); 
adr = (long)str1;
 
printf ("&hello1 = %d ",adr); 
 
str2 = (char*)adr;
//free (str1);
 
str1 = "new string";
printf ("\n");
printf ("str1 = %s ",str1);
printf ("str2 = %s ",str2);
}

int i = 0;
while (pa[i])
{
printf("*pa[%d] = %c\n", i , *pa[i]); i++;
}

int main()
{
    char *pa[] = {"123","456","789", NULL};
    int i = 0;
    while (pa[i])
    {
        printf("pa[%d] = %s\n", i , pa[i]); i++;
    }
}

char *pa[] = {"dog", "cat", "mouse", NULL};
 
int i = 0;
while (pa[i])
{
printf("*pa[%d] = %c\n", i , *pa[i]+2); i++;
}

printf("*pa[%d] = %c\n", i, pa[i++][2]);

*pa[i++][2]

char pa[][9] = {"dog", "cat", "mouse", NULL};
 
int i = 0;
while (pa[i])
{
    printf("*pa[%d] = %s\n", i , pa[i++]);
}

while (i < std::size(pa))

while (*pa[i])

char pa[][9] = {"dog", "cat", "mouse", 0};

char pa[][9] = {"dog", "cat", "mouse", { 0 }};