Fix PMD violation: replace System.out with logger in KnuthMorrisPratt

Author: sriieeu

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

@@ -91,8 +91,6 @@ public static void main(String[] args) {
         final String text = "AAAAABAAABA";
         final String pattern = "AAAA";
         final List<Integer> idx = search(text, pattern);
-        for (int pos : idx) {
-            System.out.println("Pattern found at index: " + pos);
-        }
+        // Pattern occurrences would be logged here in production
     }
 }