I think you may be confused about copyright law. By not giving a license <https://github.com/fncodr/tblous/blob/master/LICENSE.md>, it means that you are going with the *default* of copyright law: *no one else is allowed to copy or modify your code*. (Under US copyright law, everything is copyrighted by default.) You should always go with a standard license text rather than trying to write something yourself, as almost anything you write could have unintended consequences; if you want a simple permissive license that allows people to do whatever they want with your code, the MIT License <https://opensource.org/licenses/MIT> is a good choice.
Note also that you seem to have some overlap with https://github.com/JuliaLang/DataStructures.jl
