variable in Rust

Rust uses the let keyword to declare a variable.
The name of a variable can be composed of letters, digits, and the underscore character. It must begin with either a letter or an underscore. Upper and lowercase letters are distinct because Rust is case-sensitive.
```
   let langauge = "Rust";    // string type
   let rating = 4.5;         // float type
   let isGrowing = true;     // boolean type
   let icon = '♥';           // unicode character type
```
By default, Rust variables are immutable − read only. In other words, the variable's value cannot be changed once a value is bound to a variable name.
Prefix the variable name with mut keyword to make it mutable. The value of a mutable variable can be changed.
```
   let mut fees:i32 = 25_000;
```
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