title: How do I make an old commit the current master commit with git?
body: <p>Here are my commits:</p>
  
  <p>A B C</p>
  
  <p>With C being the current commit. I want things to look like this on origin:</p>
  
  <p>A B C A</p>
  
  <p>So A is my current commit, but B and C are retained. I currently have the repo cloned with C being the current commit. What do I need to do next to get origin how I want it?</p>