yep, thanks for notice

1. I will fix it
2. It is clear, the sample test shouldn't be edit by trainer
3. ATM in the ATM in real bank is login one account one time too (This is a single machine implementation, not a cluster)
4. For really, i think it is not important, and also rewrite it needs many times, and it will make all the current solutions invaild it is a big revision, so, i will not ediy it
5. For really, i think current random tests count is the nough, but types really is less, i will add more other type, but not many

The sample test has a syntax error

The two problems you wrote was all fixed just now

Thank for your notices, i will fix error you said, if you willing, you can help me make description more clear

Fixed

Fixed