How to merge a slave branch into master and replace all content?

Question

git

Good time to all participants!
Tell the newbie how to merge a secondary (let’s say slave) branch into master so that it replaces all the contents of master with its own, and the data from master is deleted.
For example:
master>
index.php
a.php
b.php
d.php
slave>
index.php (modified)
b.php (modified)
c.php
d.php
output should be:
master>
index.php (modified)
b.php (modified)
c.php
d.php
as if the master branch should be deleted, and then the slave branch is renamed to master and then it becomes the main branch.

Answer 1

Tell the newbie how to merge a secondary (let’s say slave) branch into master so that it replaces all the contents of master with its own, and the data from master is deleted.

To have an honest merge and a continuous history:

git checkout slave
git merge -s ours master # смёржить master в slave, оставив только содержимое slave
git checkout master
git merge slave

Answer 2

git branch -d master
git branch -m slave master