The commonly used go language development kit

Some usual toolkit，include：

Just mediate implemention in memory(publish：Topic，subscribe：channel）

only duplicate of singleflight in groupcache

program init,start,safe exit

• consistent:
• hrw:provides an implementation of Highest Random Weight hashing, an alternative to consistent hashing which is both simple and fast

• counter:multithreading counter
• waitwraper:a wrapper for simplify calling for waitgroup