Add file extensions

[rishabhsingh971]

Closes #18

Changelog:

• add file extension for programming language
• add file extension for database language
• handle differentiate languages with same extensions (e.g python2 and python3)

[rajatgoyal715]

I have asked some questions, and have given some improvement suggestions.

[rajatgoyal715]

Closes #18

Changelog:

• add file extension for programming language
• add file extension for database language
• handle differentiate languages with same extensions (e.g python2 and python3)

Can you please explain the third point to me?

[rishabhsingh971]

Closes #18
Changelog:

• add file extension for programming language
• add file extension for database language
• handle differentiate languages with same extensions (e.g python2 and python3)

Can you please explain the third point to me?

Currently for the same problem if the solution is submitted in languages, whose extension is same, they all will have the same name. e.g if slug of the challenge is hello-world and solution is submitted in python3 as well as python2, name of the file generated for both language submission will be hello-world.py

[rishabhsingh971]

Closes #18
Changelog:

• add file extension for programming language
• add file extension for database language
• handle differentiate languages with same extensions (e.g python2 and python3)

Can you please explain the third point to me?

Currently for the same problem if the solution is submitted in languages, whose extension is same, they all will have the same name. e.g if slug of the challenge is hello-world and solution is submitted in python3 as well as python2, name of the file generated for both language submission will be hello-world.py

For now, I have added two flags to counter this problem:

1. To make a separate folder for different languages e.g Hackerrank/Regex/Introduction/python3/matching.py and Hackerrank/Regex/Introduction/python/matching.py

2. To prepend language in file extension e.g Hackerrank/Regex/Introduction/matching.python3.py and Hackerrank/Regex/Introduction/matching.python.py

They will be functional after #24.
Please suggest any other and/or better solution for this