Changes to User/lukechin

• 2018-01-22 20:03:25 UTC (lukechin): update experience
• 2018-01-21 22:34:39 UTC (lukechin): update CSAPP practice
• 2018-01-21 08:49:53 UTC (lukechin): 調整版面
• 2018-01-21 08:46:59 UTC (lukechin): establish personal profile for 2017 fall