//split by separator and pick the first one. 
  //This has all the characters till null excluding null itself.
  retByteArray := bytes.Split(byteArray[:], []byte{0}) [0]

  // OR 

  //If you want a true C-like string including the null character
  retByteArray := bytes.SplitAfter(byteArray[:], []byte{0}) [0]
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