small fix for str len

lib/parfait/list.rb

@@ -1,33 +0,0 @@
-class List
-
-  def initialize
-    @next = nil
-  end
-  def empty?
-    @next.nil?
-  end
-
-  def get(key)
-    @next ?  @next.get(key) : nil
-  end
-
-  def set(key , value)
-    @next ? @next.set(key,value) : @next = Node.new(key,value)
-    value
-  end
-end
-
-class Node < List
-  def initialize(key,value)
-    @key = key
-    @value = value
-  end
-  def get(key)
-    @key == key ? @value : super(key)
-  end
-  def set(key,value)
-    @key == key ? @value = value : super(key,value)
-  end
-end
-
-# https://www.youtube.com/watch?v=HJ-719EGIts