fix cpp ws client not exit when finished problem (#628)

zhaomingwork

2023-06-14 dde24214fecb1178f5c130f09ad162a1e5847877

1
2
3
4
5
6
7
8
9
10
M    million
MLN    million
m    million
mln    million
B    billion
b    billion
BN    billion
bn    billion
K    thousand
k    thousand