#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *substring(char *str, char *buf, int start, int end) {
for (int i = start; i < end; i++)
buf[i] = str[i];
return buf;
}
int main() {
if (strncmp(substring
("Hello World", texto
, 0, 5), "Hello", 5) == 0) return 0;
}
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