Now only lowercase letters and numbers are generated

src/main/java/tk/draganczuk/url/Utils.java

@@ -10,14 +10,12 @@ public class Utils {
 		int rightLimit = 122; // letter 'z'
 		int targetStringLength = 10;
 
-		String generatedString = random.ints(leftLimit, rightLimit + 1)
-				.filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97))
+		return random.ints(leftLimit, rightLimit + 1)
+				.filter(i -> (i <= 57 || i >= 97))
 				.limit(targetStringLength)
 				.collect(StringBuilder::new,
 						StringBuilder::appendCodePoint,
 						StringBuilder::append)
 				.toString();
-
-		return generatedString;
 	}
 }