Update Vector.md

Another way of defining an empty vector

solutions/collections/Vector.md

@@ -28,6 +28,39 @@ fn main() {
 }
 
 fn is_vec(v: &Vec<u8>) {}
+
+
+//Another solution 
+
+
+fn main() {
+    let arr: [u8; 3] = [1, 2, 3];
+    
+    let v = Vec::from(arr);
+    is_vec(&v);
+
+    let v = vec![1, 2, 3];
+    is_vec(&v);
+
+    // vec!(..) and vec![..] are same macros, so
+    let v = vec!(1, 2, 3);
+    is_vec(&v);
+    
+    // in code below, v is Vec<[u8; 3]> , not Vec<u8>
+    // USE Vec::new and `for` to rewrite the below code 
+    let mut v1 = vec!();
+    for i in &v{
+        v1.push(*i);
+    }
+    is_vec(&v1);
+ 
+    assert_eq!(v, v1);
+
+    println!("Success!")
+}
+
+fn is_vec(v: &Vec<u8>) {}
+
 ```
 
 2.
@@ -215,4 +248,4 @@ fn main() {
         ip.display();
     }
 }
-```
+```