Added bytesToHex converter

src/main/java/Main/Utils.java

@@ -0,0 +1,15 @@
+package Main;
+
+public class Utils {
+    private static String bytesToHex(byte[] hash) {
+        StringBuilder hexString = new StringBuilder(2 * hash.length);
+        for (byte b : hash) {
+            String hex = Integer.toHexString(0xff & b);
+            if (hex.length() == 1) {
+                hexString.append('0');
+            }
+            hexString.append(hex);
+        }
+        return hexString.toString();
+    }
+}