simplify writing binary

loop as should be, fixes the problem (one problem at least)

test/risc/test_machine.rb

@@ -39,10 +39,10 @@ module Risc
       assert_equal 0 ,  Position.get(@machine.cpu_init).at
     end
     def test_cpu_at
-      assert_equal "0x5ad0" ,  Position.get(@machine.cpu_init.first).to_s
+      assert_equal "0x5ad8" ,  Position.get(@machine.cpu_init.first).to_s
     end
     def test_cpu_bin
-      assert_equal "0x5ac4" ,  Position.get(Position.get(@machine.cpu_init.first).binary).to_s
+      assert_equal "0x5acc" ,  Position.get(Position.get(@machine.cpu_init.first).binary).to_s
     end
     def test_cpu_label
       assert_equal Position::InstructionPosition ,  Position.get(@machine.cpu_init.first).class

test/risc/test_text_writer.rb

@@ -30,6 +30,7 @@ module Risc
     def test_sorted_positions1
       sorted_objects = @text_writer.sorted_objects
       sorted_objects.each_slice(2) do |l,r|
+        next unless r
         assert Position.get(l).at < Position.get(r).at , "#{Position.get(l)} < #{Position.get(r)} , #{l.class}, #{r.class}"
       end
     end
@@ -37,7 +38,6 @@ module Risc
       sorted_objects = @text_writer.sorted_objects
       sorted_objects.shift
       sorted_objects.each_slice(2) do |l,r|
-        next unless l
         next unless r
         assert Position.get(l).at < Position.get(r).at , "#{Position.get(l)} < #{Position.get(r)} , #{l.class}, #{r.class}"
       end