Clean up some solutions.

day6.cr

@@ -2,20 +2,12 @@ require "advent"
 INPUT = input(2020, 6).split("\n\n")
 
 def part1
-  input = INPUT.clone
-  answers = input.map do |i|
-    i.chars.uniq!.count &.ascii_letter?
-  end
-  puts answers.sum
+  INPUT.sum &.chars.uniq!.count(&.ascii_letter?)
 end
 
 def part2
-  input = INPUT.clone
-  sol = input.map do |i|
-    i.split("\n").reject(&.empty?).map(&.chars.to_set).reduce { |s1, s2| s1 & s2 }
-  end
-  puts(sol.map(&.size).sum)
+  INPUT.sum &.lines.map(&.chars.to_set).intersect.size
 end
 
-part1
-part2
+puts part1
+puts part2