Delete redundant method
Simplify code
Make executable
Remove Law of Demeter violation
Fix broken tests
Rename variable
DRY
Delete useless line
Rename method, and use find_all
Add rubocop file
Squash rubocop warning
Squash rubocop warning[2]
Squash rubocop warning[3]
Squash rubocop warning[4]
Squash rubocop warning[5]
Squash rubocop warning[6]
Squash rubocop warning[7]