docs: def extract_value_from_output(canary, split_offset, kal_out):
      """Return value parsed from output.
  
      Args:
          canary(str): This string must exist in the target line.
          split_offset(int): Split offset for target value in string.
          kal_out(int): Output from kal.
      """
      retval = ""
      while retval == "":
          for line in kal_out.splitlines():
              if canary in line:
                  retval = str(line.split()[split_offset])
          if retval == "":
              retval = None
      return retval