add optimize #477

Job	Run time
cpp14-coroutine	41s
arenastring-gcc-stdlibc++-default	39s
arenastring-gcc-stdlibc++-half	33s
aarch64	2m 10s
cmake	53s
arenastring-gcc-stdlibc++-full	32s
basic-gcc-dbg-c++20-stdlibc++-asan	43s
basic-gcc-dbg-c++20-stdlibc++-tsan	46s
compatible-gcc-9	32s
arenastring-clang-stdlibc++-default	32s
coverage	44s
basic-gcc-dbg-c++14-stdlibc++-asan	52s
arenastring-clang-libc++-default	40s
workspace	32s
basic-gcc-opt-c++20-stdlibc++-asan	30s
basic-gcc-opt-c++20-stdlibc++-tsan	32s
basic-gcc-opt-c++14-stdlibc++-asan	26s
basic-clang-dbg-c++20-stdlibc++-asan	36s
basic-clang-dbg-c++20-stdlibc++-tsan	44s
basic-clang-dbg-c++20-libc++-asan	53s
basic-clang-dbg-c++20-libc++-tsan	41s
basic-clang-dbg-c++14-stdlibc++-asan	38s
basic-clang-dbg-c++14-libc++-asan	47s
basic-clang-opt-c++20-stdlibc++-asan	41s
basic-clang-opt-c++20-stdlibc++-tsan	32s
basic-clang-opt-c++20-libc++-asan	49s
basic-clang-opt-c++20-libc++-tsan	48s
basic-clang-opt-c++14-stdlibc++-asan	45s
basic-clang-opt-c++14-libc++-asan	47s
	20m 58s

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