Updating how String can be casted into an Array.

Just wanted to update the syntax from Array(self.characters) to Array(self). Similarly for casting of the ptnr String.

Author: RobertoEfrainHernandez

Knuth-Morris-Pratt/KnuthMorrisPratt.swift

@@ -12,8 +12,8 @@ extension String {
 
   func indexesOf(ptnr: String) -> [Int]? {
 
-    let text = Array(self.characters)
-    let pattern = Array(ptnr.characters)
+    let text = Array(self)
+    let pattern = Array(ptnr)
 
     let textLength: Int = text.count
     let patternLength: Int = pattern.count