the atomic structure file STRU_ION_D should be standardized and formatted

[xdzhu]

Describe Current Status and Possible Solution

the atomic structure output STRU_ION_D should be standardized and formatted

Comparing to the CONTCAR in VASP output files with well-organized and aligned format, the STRU_ION_D of ABACUS is disorderly, not aligned and also inconvenient to column operation.

Please make the STRU_ION_D file more organized and format the floating number as decimal notation rather than scientific notation.

Example:
VASP CONTCAR

ABACUS STRU_ION_D

Additional Context

No response

[mohanchen]

This is an excellent suggestion! Thanks!

[dyzheng]

This Issue is not related with #2606 , you can treat it in your own way. @sunliang98 @YuLiu98

[YuLiu98]

This Issue is not related with #2606 , you can treat it in your own way. @sunliang98 @YuLiu98

I think the Formatter proposed in #2606 can also be used here.

[hongriTianqi]

@dyzheng I will solve this issue.

[kirk0830]

A small library has been developed to handle with string formatting tasks. Pull request will be submit very soon.

[hongriTianqi]

This issue is systematically solved by one PR, so is a good practice.