change directory names

18/5/main.rb

@@ -0,0 +1,49 @@
+require 'pry'
+
+input = File.open('input') {|file| file.readline}
+
+('a'..'z').each do |letter|
+  output = input
+  temp = ""
+
+  i = 0
+  while i != output.length
+    if output[i].downcase != letter
+      temp += output[i]
+    end
+    i += 1
+  end
+
+  output = temp
+  temp = ""
+
+  removed = true
+
+  while removed
+    removed = false
+
+    i = 1
+    while i < output.length
+      if output[i - 1] != output[i] && output[i - 1].downcase == output[i].downcase
+        removed = true
+        i += 2
+
+        if i == output.length
+          temp += output[-1]
+        end
+      else
+        temp += output[i - 1]
+        i += 1
+
+        if i == output.length
+          temp += output[-1]
+        end
+      end
+    end
+
+    output = temp
+    temp = ""
+  end
+
+  puts "#{letter}: #{output.length}"
+end