Add kotlin code for the chapter of divide and conquer

[curtishd]

If this pull request (PR) pertains to Chinese-to-English translation, please confirm that you have read the contribution guidelines and complete the checklist below:

• This PR represents the translation of a single, complete document, or contains only bug fixes.
• The translation accurately conveys the original meaning and intent of the Chinese version. If deviations exist, I have provided explanatory comments to clarify the reasons.

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[krahets]

Thanks for your contribution!

[krahets]

It's recommended to re-fork the repo before submitting a new PR to eliminate the redundant linear history.

Or you can avoid re-fork by making changes in a new branch while keeping the main branch of your forked repo synchronized with the main branch of the origin repo.