Fixed slice() returning empty string when referring to last character (#751)

* Fixed slice() returning empty string when referring to last character

src/main/java/carpet/script/value/ListValue.java

@@ -341,7 +341,7 @@ public class ListValue extends AbstractListValue implements ContainerValueInterf
         int from = normalizeIndex(fromDesc, size);
         if (toDesc == null)
             return new ListValue((Collection<? extends Value>) getItems().subList(from, size));
-        int to = normalizeIndex(toDesc, size);
+        int to = normalizeIndex(toDesc, size+1);
         if (from > to)
             return ListValue.of();
         return new ListValue((Collection<? extends Value>) getItems().subList(from, to));

src/main/java/carpet/script/value/Value.java

@@ -186,7 +186,7 @@ public abstract class Value implements Comparable<Value>, Cloneable
         int size = value.length();
         int from = ListValue.normalizeIndex(fromDesc, size);
         if (toDesc == null) return new StringValue(value.substring(from));
-        int to = ListValue.normalizeIndex(toDesc, size);
+        int to = ListValue.normalizeIndex(toDesc, size+1);
         if (from > to) return StringValue.EMPTY;
         return new StringValue(value.substring(from, to));
     }