Add solutions for first excercises and test

Cargo.lock

@@ -600,7 +600,7 @@ dependencies = [
 
 [[package]]
 name = "rustlings"
-version = "1.4.0"
+version = "1.4.1"
 dependencies = [
  "assert_cmd 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",

exercises/functions/functions1.rs

@@ -5,8 +5,7 @@ fn main() {
     call_me();
 }
 
-
+fn call_me() {}
-
 
 
 

exercises/functions/functions2.rs

@@ -5,7 +5,7 @@ fn main() {
     call_me(3);
 }
 
-fn call_me(num) {
+fn call_me(num: i32) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }

exercises/functions/functions3.rs

@@ -2,7 +2,7 @@
 // Make me compile! Scroll down for hints :)
 
 fn main() {
-    call_me();
+    call_me(5);
 }
 
 fn call_me(num: i32) {

exercises/functions/functions4.rs

@@ -9,7 +9,7 @@ fn main() {
     println!("Your sale price is {}", sale_price(original_price));
 }
 
-fn sale_price(price: i32) -> {
+fn sale_price(price: i32) -> i32 {
     if is_even(price) {
         price - 10
     } else {

exercises/functions/functions5.rs

@@ -7,7 +7,7 @@ fn main() {
 }
 
 fn square(num: i32) -> i32 {
-    num * num;
+    num * num
 }
 
 

exercises/if/if1.rs

@@ -7,6 +7,7 @@ pub fn bigger(a: i32, b: i32) -> i32 {
     // - another function call
     // - additional variables
     // Scroll down for hints.
+    if a > b { a } else { b }
 }
 
 // Don't mind this for now :)

exercises/test1.rs

@@ -10,6 +10,14 @@
 // Put your function here!
 // fn ..... {
 
+fn calculate_price(amount: i32) -> i32 {
+    if amount > 40 {
+        amount * 1
+    } else {
+        amount * 2
+    }
+}
+
 // Don't modify this function!
 #[test]
 fn verify_test() {

exercises/variables/variables1.rs

@@ -2,7 +2,7 @@
 // Make me compile! Scroll down for hints :)
 
 fn main() {
-    x = 5;
+    let x = 5;
     println!("x has the value {}", x);
 }
 

exercises/variables/variables2.rs

@@ -2,7 +2,7 @@
 // Make me compile! Scroll down for hints :)
 
 fn main() {
-    let x;
+    let x: i32 = 0;
     if x == 10 {
         println!("Ten!");
     } else {

exercises/variables/variables3.rs

@@ -2,7 +2,7 @@
 // Make me compile! Scroll down for hints :)
 
 fn main() {
-    let x = 3;
+    let mut x = 3;
     println!("Number {}", x);
     x = 5;
     println!("Number {}", x);

exercises/variables/variables4.rs

@@ -2,7 +2,7 @@
 // Make me compile! Scroll down for hints :)
 
 fn main() {
-    let x: i32;
+    let x: i32 = 10;
     println!("Number {}", x);
 }