# Functions
Mask 字符串遮掩操作（不支持中文）.
MaskAddress 地址遮掩 仅遮掩地址内数字部分 // todo rule.
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NonceStr 获取随机字符串.
StrInSlice 判断指定字符是否在切片中 https://blog.51cto.com/u_15023263/2558348.
UuidStr 获取UUID.
# Structs
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