camel string, xx_yy to XxYy.

将"_"转换为"-".

map map[int32]string map 的 key 必须从 0 开始，顺序排列 sep is placed between elements in the resulting string.

map map[int]string map 的 key 必须从 0 开始，顺序排列 sep is placed between elements in the resulting string.

字符串命名参数格式化，明明参数用 { } 包裹，类似于python “xxx{data}xxx”.format(data=aaa).

snake string, XxYy to xx_yy , XxYY to xx_yy.

string to int32.

string to int64.

Trim string cutset.

Trim string space.