#include <stdio.h>
#include <string.h>
int main() {
const char *str = "Hello, world! This is a test.";
const char *substr = "world";
const char *result = strstr(str, substr);
if (result != NULL) {
printf("Substring found at position: %ld\n", result - str);
} else {
printf("Substring not found.\n");
}
return 0;
}
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