Step 1.5: Conversions, casting and dereferencing

[ziimakc]

Resolves Step 1.5

Task

Implement the following types:

1. EmailString - a type, which value can be only a valid email address string.
2. Random<T> - a smart pointer, which takes 3 values of the pointed-to type on creation and points to one of them randomly every time is used.

Provide conversion and Deref implementations for these types on your choice, to make their usage and interoperability with std types easy and ergonomic.

Solution

Create EmailString and Random<T> types and useful conversions/Deref implementations.