start a new ruby layer to do the to_vool conversion

the "normalization" is getting more and more complicated and is not tested
And it seems i really don't like working with the untyped ast

lib/ruby/send_statement.rb

@@ -0,0 +1,39 @@
+module Ruby
+
+  class SendStatement < Statement
+    attr_reader :name , :receiver , :arguments
+
+    def initialize(name , receiver , arguments )
+      @name , @receiver , @arguments = name , receiver , arguments
+      @arguments ||= []
+    end
+
+    def normalize
+      statements = Statements.new([])
+      arguments = []
+      @arguments.each_with_index do |arg , index |
+        normalize_arg(arg , arguments , statements)
+      end
+      if statements.empty?
+        return SendStatement.new(@name, @receiver , @arguments)
+      else
+        statements << SendStatement.new(@name, @receiver , arguments)
+        return statements
+      end
+    end
+
+    def normalize_arg(arg , arguments , statements)
+      if arg.respond_to?(:slot_definition) and !arg.is_a?(SendStatement)
+        arguments << arg
+        return
+      end
+      assign = LocalAssignment.new( "tmp_#{arg.object_id}".to_sym, arg)
+      statements << assign
+      arguments << LocalVariable.new(assign.name)
+    end
+
+    def to_s
+      "#{receiver}.#{name}(#{arguments.join(', ')})"
+    end
+  end
+end