Get the diff of two slices.

GetChineseFirstLetter 获取中文字符串第一个首字母.

Get the current timestamp by Mill.

Get the current timestamp by Nano.

Get the intersection of two slices.

IsAlphaNumeric 判断字符串是否为字母数字.

judge a string whether in the string list.

The incoming parameter must be a pointer.

* KMP * */.

Convert nano timestamp to time.Time type.

Utf8ToGbk.