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structs7.rs added

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`1`	`1`	`//We can use #[derive(Debug)] to make a struct printable.`
	`2`	`+/*`
	`3`	`+/ Fill the blanks to make the code work`
	`4`	`+#[__]`
	`5`	`+struct Rectangle {`
	`6`	`+ width: u32,`
	`7`	`+ height: u32,`
	`8`	`+}`
	`9`	`+`
	`10`	`+fn main() {`
	`11`	`+ let scale = 2;`
	`12`	`+ let rect1 = Rectangle {`
	`13`	+ width: dbg!(30 * scale), // Print debug info to stderr and assign the value of `30 * scale` to `width`
	`14`	`+ height: 50,`
	`15`	`+ };`
	`16`	`+`
	`17`	`+ dbg!(&rect1); // Print debug info to stderr`
	`18`	`+`
	`19`	`+ println!(__, rect1); // Print debug info to stdout`
	`20`	`+}`
	`21`	`+*/`

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