how to fix fatal: unable to access 'https://github.com/MdAtifuzzaman01/Hackerrank-30-Days-of-Code.git/': Could not resolve host: github.com code example

Example: fatal: unable to access 'https://github.com/swarooprk7/tedx_sit.git/': Could not resolve host: github.com

git config --global --unset https.proxy