fix bug for cpp msg not return right name

zhaomingwork

2023-05-13 f2e7ea83c9d8b580d09eb31acf6c2fa60e683e3b

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p.m.    PM
p.m    PM
pm    PM
P.M.    PM
P.M    PM
PM    PM
a.m.    AM
a.m    AM
am    AM
A.M.    AM
A.M    AM
AM    AM