Update ch. 7-20 to current origin

Author: pavloslav

listings/ch02-guessing-game-tutorial/listing-02-01/Cargo.toml

@@ -1,8 +1,7 @@
 [package]
 name = "guessing_game"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

listings/ch02-guessing-game-tutorial/listing-02-01/src/main.rs

@@ -25,7 +25,7 @@ fn main() {
     // ANCHOR_END: expect
 
     // ANCHOR: print_guess
-    println!("You guessed: {}", guess);
+    println!("You guessed: {guess}");
     // ANCHOR_END: print_guess
 }
 // ANCHOR: all

listings/ch02-guessing-game-tutorial/listing-02-02/Cargo.lock

@@ -1,10 +1,9 @@
 [package]
 name = "guessing_game"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.5.5"
+rand = "0.8.3"

listings/ch02-guessing-game-tutorial/listing-02-02/Cargo.toml

@@ -11,5 +11,5 @@ fn main() {
         .read_line(&mut guess)
         .expect("Failed to read line");
 
-    println!("You guessed: {}", guess);
+    println!("You guessed: {guess}");
 }

listings/ch02-guessing-game-tutorial/listing-02-02/src/main.rs

@@ -1,10 +1,9 @@
 [package]
 name = "guessing_game"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.5.5"
+rand = "0.8.3"

listings/ch02-guessing-game-tutorial/listing-02-03/Cargo.lock

@@ -8,10 +8,10 @@ fn main() {
     println!("Guess the number!");
 
     // ANCHOR: ch07-04
-    let secret_number = rand::thread_rng().gen_range(1, 101);
+    let secret_number = rand::thread_rng().gen_range(1..=100);
     // ANCHOR_END: ch07-04
 
-    println!("The secret number is: {}", secret_number);
+    println!("The secret number is: {secret_number}");
 
     println!("Please input your guess.");
 
@@ -21,7 +21,7 @@ fn main() {
         .read_line(&mut guess)
         .expect("Failed to read line");
 
-    println!("You guessed: {}", guess);
+    println!("You guessed: {guess}");
     // ANCHOR: ch07-04
 }
 // ANCHOR_END: ch07-04

listings/ch02-guessing-game-tutorial/listing-02-03/Cargo.toml

@@ -1,10 +1,9 @@
 [package]
 name = "guessing_game"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.5.5"
+rand = "0.8.3"