Challenge 1.
Challenge 2.
Challenge 3.
Challenge 4.
That was dumb.
Challenge 5.
Challenge 6.
Morse code.
Bottles of beer.
Challenge 9 sorting.
Challenge 10, validate phone number without regex.
Dates.
Challenge 12 permutations.
Challenge 13 counting days.
Challenge 14 - slice and reverse.
Challenge 15 - left and righ justify text.
Challenege 16 - remove duplicates.
Challenge 17 - semi christmas trees.
Challenege 18 - phone number letters.
Challenge 19 - counting characters.