flatten simple array
multi dimension array
flatten([null])
flatten mixed array
skip deep flatten
best solution from codewar
Merge branch 'flatten'
add test into all-tests.html
calculate max cackes can bake
needless recipes
Merge branch 'pete_the_baker'
add test into all-tests.html
refactoring => separate code with test
Merge branch 'pete_the_baker'
count empty string
one occurrence per char
more occurrences
mixed occurrences
refactoring => using string.split()
refactoring => separate code with test