title: git master cannot merge branch
body: <p>I'm new to git and I have created a branch (b1) from master</p>
  
  <p>but the issue is, in the b1 branch has the codes I need and I need to merge those codes to master.but when i checkout to the master and try to merge the the b1 branch in to the master it says already updated.but that is not true. any suggestion </p>