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// Takes a printf-style format string and returns a formatted string.
char *format(char *fmt, ...) {
char *buf;
size_t buflen;
FILE *out = open_memstream(&buf, &buflen);
va_list ap;
va_start(ap, fmt);
vfprintf(out, fmt, ap);
va_end(ap);
fclose(out);
return buf;
}
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