"HEAD" and Commit ID showing inside my code

"HEAD" and Commit ID showing inside my code

After creating a pull request, 


I see a two things I don't understand (lines 941 - 945 and 963 - 967):  


here:

  1. 941 +<<<<<<< HEAD
  2. <my code change>
  3. 945 +>>>>>>> 68178ff366b6e59f85ad772c0711f826b5b494ef
and here,

  1. 963 +<<<<<<< HEAD
  2. <my code change>
  3. 967 +>>>>>>> 68178ff366b6e59f85ad772c0711f826b5b494ef
That ID on 945 & 967 is a prior commit, 

Those extra lines (941, 945, 963, 967) are not in my local version.

I'm still learning git, and I don't see anything addressing this weirdness in the docs so far.

How do I clean those lines without making a mess?