how to delete a local master branch and full from origin code example

Example 1: git delete origin branch

$ git push -d <remote_name> <branch_name>
$ git branch -d <branch_name>

Example 2: git delete master branch and recreate

git checkout better_branch
git merge --strategy=ours master    # keep the content of this branch, but record a merge
git checkout master
git merge better_branch             # fast-forward master up to the merge