fix tester.cpp

lyblsgo

2023-03-21 84c9b0c3478c18f3dd8bb80f8ffbd15f10c1ac62

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.