Fix word offset

which had weirdly been 1 off
(not weird that it was off, index bugs are common, but weird that the tests passed anyway)

lib/arm/translator.rb

@@ -147,8 +147,8 @@ module Arm
       send( name , int_code )
     end
 
-    def putstring( int_code )
+    def putstring( int_code )    # adjust for object header (0 based, hence -1)
-      codes = ArmMachine.add( :r1 ,  :r1 , Parfait::Word.type_length*4 ) # adjust for object header
+      codes = ArmMachine.add( :r1 ,  :r1 , (Parfait::Word.type_length - 1)*4 )
       codes.append ArmMachine.mov( :r0 ,  1 )  # write to stdout == 1
       syscall(int_code , codes )
     end

lib/parfait/word.rb

@@ -139,7 +139,7 @@ module Parfait
       raise "index not integer #{at.class}" unless at.is_a?(::Integer)
       raise "index must be positive , not #{at}" if (index < 0)
       raise "index too large #{at} > #{self.length}" if (index >= self.length )
-      return index + 8 # type_length * 4
+      return index + Word.type_length * 4
     end
 
     # compare the word to another

test/parfait/test_word2.rb

@@ -98,10 +98,10 @@ module Parfait
       assert_raises {one.set_char(3 , "s".ord)}
     end
     def test_max
-      str = "123456789012345678901234"
+      str = "12345678901234567890"
       one = Parfait.new_word(str)
       assert_equal str , one.to_string
-      assert_equal 24 , one.length
+      assert_equal 20 , one.length
     end
 
   end