### Question:
StringUtils { public static String buildPackageName( String basePackageName, String packageName, String... subPackageNames) { StringBuilder stringBuilder = new StringBuilder(basePackageName + "." + packageName); if (subPackageNames != null) { for (String subPackageName : subPackageNames) { stringBuilder.append("."); stringBuilder.append(subPackageName); } } return stringBuilder.toString(); }  static String toEnumConstant(String value); static String buildPackageName(
      String basePackageName, String packageName, String... subPackageNames); static String capitalize(String value); static String toEnumClass(String value); static String getReturnTypeFromGetter(String getterName);  }### Answer:
@Test public void testBuildPackageName() { assertEquals("com.github.kklisura", StringUtils.buildPackageName("com.github", "kklisura")); }