fix some typos

Signed-off-by: cui fliter <imcusg@gmail.com>

solutions/basic-types/functions.md

@@ -117,7 +117,7 @@ fn main() {
         }
     };
 
-    println!("Excercise Failed if printing out this line!");
+    println!("Exercise Failed if printing out this line!");
 }
 
 ```

solutions/functional-programing/closure.md

@@ -246,7 +246,7 @@ fn main() {
 
 ```rust
 /* Fill in the blank and fix the errror */
-// You can aslo use `impl FnOnce(i32) -> i32`
+// You can also use `impl FnOnce(i32) -> i32`
 fn create_fn() -> impl Fn(i32) -> i32 {
     let num = 5;
 

solutions/generics-traits/trait-object.md

@@ -95,7 +95,7 @@ fn main() {
 
     for bird in birds {
         bird.quack();
-        // when duck and swan turns into Bird, they all forgot how to fly, only remeber how to quack
+        // when duck and swan turns into Bird, they all forgot how to fly, only remember how to quack
         // so, the below code will cause an error
         // bird.fly();
     }

solutions/result-panic/panic.md

@@ -10,13 +10,13 @@ fn drink(beverage: &str) {
         panic!("drinked, duang.....peng!")
      }
 
-    println!("Excercise Failed if printing out this line!");
+    println!("Exercise Failed if printing out this line!");
 }
 
 fn main() {
     drink("lemonade");
 
-    println!("Excercise Failed if printing out this line!");
+    println!("Exercise Failed if printing out this line!");
 }
 ```