How to do this kind of push?

two computers, pc1 pc2.

pc1 push project1 to https://xxxx@github.com/xxxx/.

git init
git add  project1/
git commit -m "from pc1"  
git remote add origin  ttps://xxxx@github.com/xxxx/yyyy.git
git push -u origin master

succeeded.

now you need to use the same code on pc2 under https://xxxx@github.com/xxxx/.
from project2, push above pc2

git init
git add  project2/
git commit -m "from pc1"  
git remote add origin  https://xxxx@github.com/xxxx/yyyy.git
git push -u origin master

error

error: failed to push some refs to" https://xxxx@github.com/xxxx/."
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., "git pull.") Before pushing again.
hint: See the "Note about fast-forwards" in" git push-- help" for details.

Code modified to

rm -rf .git
git init
git add  project2/
git commit -m "from pc1"  
git remote add origin  https://xxxx@github.com/xxxx/yyyy.git
git pull
git push -u origin master

error report:
error: failed to push some refs to" https://xxxx@github.com/xxxx/."
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (employees
hint: "git pull.") Before pushing again.
hint: See the "Note about fast-forwards" in" git push-- help" for details.

The

code continues to be modified to

rm -rf .git
git init
git add  project2/
git commit -m "from pc1"  
git remote add origin  https://xxxx@github.com/xxxx/yyyy.git
git pull origin master 




    From https://xxxx@github.com/xxxx/yyyy.git
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
fatal: refusing to merge unrelated histories

git push -u origin master



error: failed to push some refs to "https://xxxx@github.com/xxxx/yyyy.git"

hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (employees
hint: "git pull.") Before pushing again.
hint: See the "Note about fast-forwards" in" git push-- help" for details.
excuse me, how to solve this problem?

Mar.21,2021

rm -rf .git
git init
git remote add origin  https://xxxx@github.com/xxxx/yyyy.git
git pull origin master -sharp 
git add  project2/
git commit -m "from pc1"  
git push -u origin master
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b32611-2be17.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32611-2be17.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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