@Nullable
	default String getPackageName() {
		String className = getName();
		int packageIndex = className.lastIndexOf('/');
		if (packageIndex <= 0) return null;
		return className.substring(0, packageIndex);
	}
@return Package the class resides in.
May be {@code null} for classes in the default package.
recaf-core/src/main/java/software/coley/recaf/info/ClassInfo.java