Update to latest standard.

.editorconfig

.gitignore

.gitlab-ci.yml

.vscode/settings.json

cSpell.json

src/Cracking/StringCompression.cs

src/coding-interview.csproj

test/cracking/StringCompression.cs

test/school/Children.cs

test/school/Hanoi.cs

test/school/Portals.cs

test/sort/BubbleSort.cs

test/sort/HeapSort.cs

test/sort/InsertionSort.cs

test/sort/MergeSort.cs

test/sort/QuickSort.cs

test/sort/SelectionSort.cs

test/test.csproj

test/test.sh