## Vacancy post

For `Vacancy`, we need to calculate the energy difference between a crystal structure with and without a vacancy.
The examples of the output files `result.json` in json format and `result.out` in txt format are given below.

#### result.json

```json
{
  "[3, 3, 3]-task.000000": [
    0.7352769999999964,
    -96.644642,
    -97.379919
  ]
}
```

#### result.out

```txt
/root/auto_test_example/deepmd/confs/std-fcc/vacancy_00
Structure: 	Vac_E(eV)  E(eV) equi_E(eV)
[3, 3, 3]-task.000000:   0.735  -96.645 -97.380
```