Revert "Remove needless "end""

This reverts commit ee11f892c7a0c267a8d231744e0d263387f3dfc4.
Revert "Fix syntax error: Remove too many ")""

This reverts commit 5252a2e0300649f306ca9ab986e4d8709e14d9d4.
Revert "Use "just" instead of "only""

This reverts commit dcb31a867256a0fe729025362d7e48ba7a96e9aa.
Revert "Just reserve to forward message for dead nodes"

This reverts commit 04e1a2d0ad4f29f932a526a720f4e1a7bc1cb159.
Remove codes to send messages for dead nodes.

It should be re-introduced after 1.0.4.