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fix(structs3): Add a hint for panic (#608)

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as a totally newbie to Rust, I don't know panic statement from https://doc.rust-lang.org/book/ and rustlings in the beginning. After a hard searching of [should_panic], then I figure out panic statement. 

So it's helpful to tell the learner that write a panic statement here.
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Yang Wen 2022-02-04 22:12:02 +08:00 committed by GitHub
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commit 4f7ff5d9c7
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exercises/structs/structs3.rs
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@ -16,7 +16,7 @@ struct Package {
impl Package {
fn new(sender_country: String, recipient_country: String, weight_in_grams: i32) -> Package {
if weight_in_grams <= 0 {
// Something goes here...
// panic statement goes here...
} else {
Package {
sender_country,