Refactor getNextPrevTopic function.

[myslaf]

Added getFlatTopics function with return flatted topics from lessons.

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (6b2285d) 58.30% compared to head (bc064c7) 58.58%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/react/context/index.tsx	11.11%	8 Missing ⚠️
src/utils/course.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   58.30%   58.58%   +0.28%     
==========================================
  Files          74       75       +1     
  Lines        2077     2067      -10     
  Branches      237      230       -7     
==========================================
  Hits         1211     1211              
+ Misses        846      836      -10     
  Partials       20       20              

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[qunabu]

check prettier check before merging

[codeclimate]

Code Climate has analyzed commit bc064c7 and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

View more on Code Climate.