Repository not found. fatal: repository 'https://github.com/LunghiGroup/Hamilton_2021.git/' not found code example

Example 1: Error: Repository not found

git remote add origin  https://USERNAME:[email protected]/username/reponame.git

Example 2: repository not found

git remote set-url origin https://[email protected]/aceofwings/RotairERP.git
//your repository is probably private