#include <stdio.h>
char *f (char s[], char t[], char out[]);
int main(void)
{
char s[] = "ISBN-978-8884981431";
char t[] = "ISBN-978-8863720181";
char out[10];
return 0;
}
char *f (char s[], char t[], char out[]) {
char *orig = out;
for ( ; *s == *t ; s++, t++)
*out++ = *s;
*out = '\0';
return orig;
}
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