Changed variable names for improved readability.

Author: CasualProgrammer25

src/main/java/com/thealgorithms/strings/ZAlgorithm.java

@@ -11,35 +11,35 @@ private ZAlgorithm() {
 
     public static int[] zFunction(String s) {
         int n = s.length();
-        int[] z = new int[n];
-        int l = 0;
-        int r = 0;
+        int[] zArray = new int[n];
+        int leftBound = 0;
+        int rightBound = 0;
 
         for (int i = 1; i < n; i++) {
-            if (i <= r) {
-                z[i] = Math.min(r - i + 1, z[i - l]);
+            if (i <= rightBound) {
+                zArray[i] = Math.min(rightBound - i + 1, zArray[i - leftBound]);
             }
 
-            while (i + z[i] < n && s.charAt(z[i]) == s.charAt(i + z[i])) {
-                z[i]++;
+            while (i + zArray[i] < n && s.charAt(zArray[i]) == s.charAt(i + zArray[i])) {
+                zArray[i]++;
             }
 
-            if (i + z[i] - 1 > r) {
-                l = i;
-                r = i + z[i] - 1;
+            if (i + zArray[i] - 1 > rightBound) {
+                leftBound = i;
+                rightBound = i + zArray[i] - 1;
             }
         }
 
-        return z;
+        return zArray;
     }
 
     public static int search(String text, String pattern) {
         String s = pattern + "$" + text;
-        int[] z = zFunction(s);
+        int[] zArray = zFunction(s);
         int p = pattern.length();
 
-        for (int i = 0; i < z.length; i++) {
-            if (z[i] == p) {
+        for (int i = 0; i < zArray.length; i++) {
+            if (zArray[i] == p) {
                 return i - p - 1;
             }
         }