It might be good to code one thing completely from scratch. Why? because it might help you improve other's code, and give you the resilisence and skill to open up other's code and tinker with it. I have seen too many students only wanting to download code from github, and i feel that it is severely hampering their creativity, and thus their research impact. At one point you will have to produce some genuine code, and the coding from scratch will be helpful then.