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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void get_str(char * p)
{
    p = (char *)malloc(sizeof("abcd"));
    strcpy(p , "abcd");
    return ;
}
int main()
{
    char * p = NULL;
    get_str(p);
    printf("p = %p\n", p);
    return 0;
}
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