#include <stdio.h>
void swap(char **s1, char **s2)
{
    char *temp;
    temp = *s1;
    *s1 = *s2;
    *s2 = temp;
}
int main() {
    char *s1 = "aissam";
    char *s2 = "abouqassime";
    swap(&s1, &s2);
    printf("%s\n", s1);
    return 0;
}