#include <stdlib.h>
#include <string.h>
struct Hash
{
        char *pointname;
};
 
int main()
{
    char buff[10] = "FIRST";
    int a = 0;
    struct Hash hashes[10];
    hashes[a].pointname = NULL;
    hashes[a].pointname = buff;
    printf("%s\n",hashes[a].pointname);
    hashes[a].pointname[2] = '!';
    printf("%s\n",buff);
    return 0;
}

FIRST
FI!ST