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structs4.rs completed

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Original file line number	Diff line number	Diff line change
`@@ -23,3 +23,23 @@ fn main() {`
`23`	`23`	`println!("Success!");`
`24`	`24`	`}`
`25`	`25`	`*/`
	`26`	`+// Fill the blank and fix the error without adding/removing new line`
	`27`	`+struct Person {`
	`28`	`+ name: String,`
	`29`	`+ age: u8,`
	`30`	`+}`
	`31`	`+fn main() {`
	`32`	`+ let age = 18;`
	`33`	`+ let mut p = Person {`
	`34`	`+ name: String::from("sunface"),`
	`35`	`+ age,`
	`36`	`+ };`
	`37`	`+`
	`38`	`+ // How can you believe sunface is only 18?`
	`39`	`+ p.age = 30;`
	`40`	`+`
	`41`	`+ // Fill the blank`
	`42`	`+ p.name = String::from("sunfei");`
	`43`	`+`
	`44`	`+ println!("Success!");`
	`45`	`+}`

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