Add all the assignment code.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

hw6/oatprograms/run23.oat

@@ -0,0 +1,6 @@
+int program (int argc, string[] argv) {
+  var strs = new string[][]{new string[]{"abc", "def"}, 
+                            new string[]{"789", "123"}};
+  print_string (strs[1][1]);
+  return 0;
+}