As I currently do not have a maven repo, you will have to install in your local maven,
I have already done the hard work for you with this and all you have to do is download this repo and run
gradlew
This will build the project and install it in to your local maven, you can then add it as a dependency in your project by using the following:
repositories {
mavenLocal()
}
dependencies {
compile "io.github.shadowchild.util:ShadowUtil:{mc_version}-{mod_version}"
}
where {mc_version} is replaced with the Minecraft Version (for instance 1.12.2)
and {mod_version} is replaced with the Mod Version (For instance 1.0)