My updated code push to master branch and then deleted the master branch

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Dear Sir/Mada,
my flutter code was not pushing in main branch then github suggest me to push into origin master, then i push it into the master branch and due to mistake i deleted master branch of my project, and locally due to space issue i have deleted my local project too,
now i want to recover my master branch which is deleted how can i recover that branch because it was my hard work of about 6 months.