用llu打印 uint64，在64位OS下编译会报如下warning：
- uint64_t num=10;
- printf("uint64: %llu\n", num);
warning: format '%llu' expects type 'long long int', but argument 4 has type 'uint64_t'
修正如下：
- #include
- printf("uint64: %" PRIu64 "\n", num);
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