Fix potential tsan race #148
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When run under TSan, a data race (https://go.dev/doc/articles/race_detector) is detected on the append of bestCommonA and B. They're never used independently, always concatenated, so replace them with a single bestCommon.
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When run under TSan, a data race (https://go.dev/doc/articles/race_detector) is detected on the append of bestCommonA and B. They're never used independently, always concatenated, so replace them with a single bestCommon.