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A String is a vector of data type u8. And it shows all vector properties while str is just a string expression.
To understand string and str differences in more detail, you can watch this video that explain the subject in detail here:
https://www.youtube.com/watch?v=ClPrjjHmo2Y
Char is the type that holds 32-bit unicode of characters.
To understand chars in more detail, additional resource can be found here:
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