Use separate directories for all challenges and homeworks
Fix ArityException cause by [] argument

That is because the function passed to reduce gets called with 0
arguments.
Use shorthand anonymous function
Add tests - both sample and full
Add solutions to all but the last function from homework1
Add the sample test for homework1
Add solution to the second challenge
Add the solution to the `uniquify` function
Add tests from another participant
Improve the solution to the first homework
Add the full tests to the second chanllenge