Add initial solution to day 2

day2.cr

@@ -0,0 +1,37 @@
+INPUT = File.read("day2.txt").lines.map(&.chomp) 
+
+def part1
+  input = INPUT.clone
+  total = 0
+  input.each do |line|
+    data = line.match(/([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)/) 
+    next unless data
+    min = data[1].to_i
+    max = data[2].to_i
+    char = data[3][0]
+    str = data[4]
+    count = str.chars.count(char)
+    total += 1 if count >= min && count <= max
+  end
+
+  puts total
+end
+
+def part2
+  input = INPUT.clone
+  total = 0
+  input.each do |line|
+    data = line.match(/([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)/) 
+    next unless data
+    min = data[1].to_i - 1
+    max = data[2].to_i - 1
+    char = data[3][0]
+    str = data[4]
+    count = str.chars.count(char)
+    total += 1 if ((str[min] == char) || (str[max] == char) ) && str[min] != str[max]
+  end
+  puts total
+end
+
+part1
+part2