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#include <stdio.h>
int est_deb(char* s1, char* s2) {
if (*s1 == '\0' || *s2 =='\0') return 1;
if (*s1 != *s2) return 0;
return est_deb(s1+1, s2+1);
}
int est_incluse(char *sub, char* s) {
if (*s == '\0') return 0;
return est_deb(sub, s) ? 1 : est_incluse(sub, s+1);
}
int main() {
printf("%d\n", est_deb("alpha", "alphabet"));
printf("%d\n", est_deb("alpaga", "alphabet"));
printf("%d\n", est_incluse("alp", "alphabet"));
printf("%d\n", est_incluse("apl", "alphabet"));
return 0;
}
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