Add usage examples and be more specific with the instructions as reviewed

subjects/concatenate/README.md

@@ -2,13 +2,17 @@
 
 ### Instructions
 
-Write a program that displays all the arguments as a single string. If there are not enough arguments it should display a new line.
+Write a program that displays all the arguments as a single string by simple putting one after each other. If there are not enough arguments it should display a new line.
 
 ### Usage
 
 ```console
 $ go run . hello there chris | cat -e
 hellotherechris$
-$ go run . a b c d| cat -e
+$ go run . a b c d | cat -e
 abcd$
+$ go run . "hello there" "how are you?"
+hello therehow are you?$
+$ go run . "hello there" " " | cat -e
+hello there $
 ```