The following lines exist in each .el file yet I believe they are only necessary in org-fc.el.

;; Package-requires: ((emacs "26.3") (org "9.3")) ;; Version: 0.1.0

Removing them from the other files will avoid the need to update each of these lines if the packages dependencies and/or version were to change in the future. That is they would only need to be updated in org-fc.el.

Also, I believe Url should be URL.