Remove unnecessary .into_iter()

src/contact.rs

@@ -1515,7 +1515,6 @@ fn split_address_book(book: &str) -> Vec<(&str, &str)> {
     book.lines()
         .collect::<Vec<&str>>()
         .chunks(2)
-        .into_iter()
         .filter_map(|chunk| {
             let name = chunk.first()?;
             let addr = chunk.get(1)?;