fix hexdump alignment for non-multiple-of-16 size

elf/src/main.rs

@@ -97,7 +97,7 @@ impl<'a> InputBytes<'a> {
       for b in chunk {
         print!(" {:02x}", b);
       }
-      print!("{: <4}", "");
+      print!("{: <1$}", "", 4 + 3 * (16 - chunk.len()));
       for b in chunk {
         let c = match char::from(*b) {
           c if c.is_ascii_graphic() => c,