Variants group and sort inputs data as the same outputs
- first, read variants and orders from the corresponding files.
- Next, You must instantiate from Variation class.
- Then pass variation array to summarize method of the object.
- Now. it's time to format the result. So instantiate from a formmatter class.
- Finally, pass variation array to format method of the recent object.
If the file of config doesn't exit, an empty array will be returned.