Golang string concatenation efficiency

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Bash:go test-bench=. -test.benchmemgoos:darwingoarch:amd64pkg:benchmarkBenchmarkConcatString-4        10000000           169Ns/op530B/op0allocs/Opbenchmarkconcatbuffer-4        100000000            11.7Ns/op2B/op0allocs/Opbenchmarkconcatbuilder-4       100000000            13.1Ns/op2B/op0allocs/Oppassok Benchmark4.416s

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-Test.bench RegExp Run only benchmarks matching regexp-test.benchmem Print Memory Allocations forBenchmarks-Test.benchtime D run each benchmark forduration d (default 1s)-test.blockprofilefile        WriteA goroutine blocking profile tofile-test.blockprofilerate rate Set blocking profiles rate (see runtime. setblockprofilerate) (Default1)  -test.count N Run tests and benchmarks N times (default1)  -test.coverprofilefile        WriteA coverage profile tofile-test.cpu list Comma-separated list of CPUs counts to run all test with-test.cpuprofilefile        WriteA CPU profile tofile-Test.failfast DoNot start new tests after the first test failure-test.list regexp list tests, examples, and benchmarks matching regexp ThenExit-test.memprofilefile        WriteA memory profile tofile-test.memprofilerate rate Set memory profiling rate (see runtime. Memprofilerate)-test.mutexprofilestring        WriteA mutex contention profile to the namedfileAfter execution-test.mutexprofilefractionint        if>=0, calls runtime. Setmutexprofilefraction () (Default1)  -test.outputdirdir        WriteProfiles todir-test.parallel N Run at the most n testsinchParallel (default4)  -Test.run RegExp Run only tests and examples matching regexp-test. Shortrun smaller test suite to save Time-test.testlogfilefile        WriteTest action Log tofile( forUse only by cmd/go)-test.timeout D Panic Test binary after duration d (default0, timeout disabled)-test.tracefile        WriteAn execution trace tofile-test.v verbose:print Additional output