Update LongestCommonPrefix.java

Author: TheDarkW3b

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

@@ -1,5 +1,7 @@
 package com.thealgorithms.strings;
 
+import java.util.Arrays;
+
 public final class LongestCommonPrefix {
     public String longestCommonPrefix(String[] strs) {
         if(strs == null || strs.length == 0) return "";