[description]

(This is not a real puzzle yet.)

Try merging the two branches together!

    git merge <otherbranch>

[setup]

echo ? > bikeshed_color
git add .
git commit -m "Initial commit"

echo green > bikeshed_color
git commit -a -m "My suggestion"

git switch -c alternative HEAD^
echo blue > bikeshed_color
git commit -a -m "This is way better"

git switch main

[setup goal]

echo ? > bikeshed_color
git add .
git commit -m "Initial commit"

echo green > bikeshed_color
git commit -a -m "My suggestion"

git switch -c alternative HEAD^
echo blue > bikeshed_color
git commit -a -m "This is way better"

git switch main

git merge alternative
echo blue-green > bikeshed_color
git add .
git commit -m "Merge"
git prune