description added and also link to the algorithm review

Author: vakhokoto

Strings/ZFunction.java

@@ -1,21 +1,25 @@
+// Initialisation of strings algorithm Z function
+// detailed review and proper examples can be seen on the link bewlow
+//
+// Link of algorithm review: https://www.geeksforgeeks.org/z-algorithm-linear-time-pattern-searching-algorithm/
 package Strings;
 
 public class ZFunction {
-    private String s;
+    private String string;
 
-    public ZFunction(String s){
-        this.s = s;
+    public ZFunction(String string){
+        this.string = string;
     }
 
     public int[] getArray(){
-        int length = s.length();
+        int length = string.length();
         int[] z = new int[length];
         int l = 0, r = 0;
         for (int i=0; i<length; i++){
             if (i > l && i <= r){
                 z[i] = Math.min(z[i - l], r - i + 1);
             }
-            while (i + z[i] < length && s.charAt(z[i]) == s.charAt(i + z[i])){
+            while (i + z[i] < length && string.charAt(z[i]) == string.charAt(i + z[i])){
                 z[i]++;
             }
             if (i + z[i] > r){