docs(iscapitalized): fix subject

- fix exercise title
- upgrade instructions
- add missing import 'piscine'
- fix white-spaces and indentation

subjects/iscapitalize/README.md

@@ -1,37 +1,42 @@
-## is-Capitalize
+## iscapitalized
 
 ### Instructions
 
-- Write a function `IsCapitalize` that takes a string and returns `true` if each word in the string begins with an uppercase letter, otherwise, and returns `false`. except for the word that begins with non-alphanumerical characters.
+Write a function `IsCapitalized` that takes a `string` as an argument and returns `true` if each word in the `string` begins with either an uppercase letter or a non-alphabetic character.
-- If the string is empty, return `false`.
+
+- If any of the words begin with a lowercase letter return `false`.
+- If the `string` is empty return `false`.
 
 ### Expected function
 
 ```go
-func IsCapitalize(s string) bool {
+func IsCapitalized(s string) bool {
 
 }
 ```
 
 ### Usage
-Here is a possible program to test your function :
+Here is a possible program to test your function:
 
 ```go
 package main
 
 import (
 	"fmt"
+	"piscine"
 )
 
 func main() {
-	fmt.Println(IsAlpha("Hello! How are you?"))
+	fmt.Println(piscine.IsCapitalized("Hello! How are you?"))
-	fmt.Println(IsAlpha("Hello How Are You"))
+	fmt.Println(piscine.IsCapitalized("Hello How Are You"))
-	fmt.Println(IsAlpha("Whats 4this 100K?"))
+	fmt.Println(piscine.IsCapitalized("Whats 4this 100K?"))
-	fmt.Println(IsAlpha("Whatsthis4"))
+	fmt.Println(piscine.IsCapitalized("Whatsthis4"))
+	fmt.Println(piscine.IsCapitalized("!!!!Whatsthis4"))
+	fmt.Println(piscine.IsCapitalized(""))
 }
 ```
 
-And its output :
+And its output:
 
 ```console
 $ go run .
@@ -39,4 +44,6 @@ false
 true
 true
 true
+true
+false
 ```