docs(zipstring): fix subject

- upgrade instructions
- added more possible outputs
- removed extra spaces

subjects/zipstring/README.md

@@ -2,9 +2,9 @@
 
 ### Instructions
 
-Write a function that takes a `string` and returns a new string that replaces every character with the number of duplicates and the character itself, deleting the extra duplications.
+Write a function that takes a `string` and returns a new `string` that replaces every character with the number of duplicates and the character itself, deleting the extra duplications.
 
-The letters are from the Latin alphabet list only, any other characters, symbols or empty spaces shall not be tested.
+- The letters are from the latin alphabet list only. Any other character, symbols, shall not be tested.
 
 ### Expected function
 
@@ -16,7 +16,7 @@ func ZipString(s string) string {
 
 ### Usage
 
-Here is a possible program to test your function :
+Here is a possible program to test your function:
 
 ```go
 package main
@@ -27,15 +27,18 @@ import (
 )
 
 func main() {
-	fmt.Println(piscine.ZipString("YouuungFellllas"))
+	fmt.Println(ZipString("YouuungFellllas"))
+	fmt.Println(ZipString("Thee quuick browwn fox juumps over the laaazy dog"))
+	fmt.Println(ZipString("Helloo Therre!"))
 }
-
 ```
 
-And its output :
+And its output:
 
 ```console
 $ go run .
 1Y1o3u1n1g1F1e4l1a1s
+1T1h2e1 1q2u1i1c1k1 1b1r1o2w1n1 1f1o1x1 1j2u1m1p1s1 1o1v1e1r1 1t1h1e1 1l3a1z1y1 1d1o1g
+1H1e2l2o1 1T1h1e2r1e1!
 $
 ```