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structs2.rs added

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	`1`	`+// Unit struct don't have any fields. It can be useful when you need to implement a trait on some type but don’t have any data that you want to store in the type itself.`
	`2`	`+`
	`3`	`+/*`
	`4`	`+`
	`5`	`+struct Unit;`
	`6`	`+trait SomeTrait {`
	`7`	`+ // ...Some behaviors defined here.`
	`8`	`+}`
	`9`	`+`
	`10`	`+// We don't care about what fields are in the Unit, but we care about its behaviors.`
	`11`	`+// So we use a struct with no fields and implement some behaviors for it`
	`12`	`+impl SomeTrait for Unit { }`
	`13`	`+fn main() {`
	`14`	`+ let u = Unit;`
	`15`	`+ do_something_with_unit(u);`
	`16`	`+`
	`17`	`+ println!("Success!");`
	`18`	`+}`
	`19`	`+`
	`20`	`+/ Fill the blank to make the code work`
	`21`	`+fn do_something_with_unit(u: __) { }`
	`22`	`+*/`

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