Fix PMD violation: replace for loop with while loop

Author: sriieeu

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

@@ -26,7 +26,8 @@ public static int[] computeLps(final String pattern) {
         final int[] lps = new int[n];
         int len = 0;
         lps[0] = 0;
-        for (int i = 1; i < n;) {
+        int i = 1;
+        while (i < n) {
             if (pattern.charAt(i) == pattern.charAt(len)) {
                 len++;
                 lps[i] = len;