You can simply git clone it and install using install.sh
git clone https://github.com/kernelxdev/cube-bin.git
After opening the directory you want to compile the cube.c program best using clang you can do literally the same with gcc just change clang to gcc
clang cube.c -o cube -lm
And then move it to usr/bin directory
sudo mv cube /usr/bin
Thanks for using the app if you will bye