Reduce code repetition #758

We have now successfully added guidelines for importing and using algorithms in this repository, inside other algorithms. This has been done to reduce code repetition and uphold code quality. Some functions do implement their own versions of data structures and helper functions, as previously, algorithms were supposed to be completely self contained. This issue initiates a search and fix so that all functions and data structures which can be imported in an algorithm should be imported.

Also as an addition to the topic, this initiative should also weed out bad code, i.e.:

• Code which does not follow the contributing guidelines.
• Code with a bad implementation.
• Bad Code in general.
• Complicated operations without comments.