A few suggestions

[ghost]

• Loading the xcolor package is not necessary, the beamer class already provides this functionality

• Loading the enumitem is not a good idea in a beamer document, this package is incompatible to beamer and causes problems, e.g. https://tex.stackexchange.com/q/393671/36296

• (my personal opinion) In the beamer context, it might be more natural to provide a theme then to use \input{...}.

[RatulSaha]

1. I think you are correct about xcolor. Please provide a source to your claim along with a pull request, I will merge it.
2. The source you provide about enumitem not being compatible with beamer is circular, since you point this issue there. Please provide a source to documentation so that I can consider this.
3. Could you please provide a pull request with this suggestion?

[ghost]

1. https://github.com/josephwright/beamer/blob/master/base/beamer.cls#L344
2. https://tex.stackexchange.com/a/31524/36296 https://tex.stackexchange.com/questions/294079/enumitem-and-enumerate-incompatibility#comment710952_294079 https://tex.stackexchange.com/questions/298803/enumitem-problem-for-resume and many more
3. see for example https://tex.stackexchange.com/a/146682/36296 for a tutorial - you can keep the syntax of the .sty file, however it needs to be renamed.