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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _remove_docstring_indent(self, docstring):
 """Remove indenting. We follow Python's convention and remove the minimum indent of the lines after the first, see: https://www.python.org/dev/peps/pep-0257/#handling-docstring-indentation preserving relative indentation. Args: docstring: A docstring. Returns: A list of strings, one per line, with the minimum indent stripped. """

    docstring = docstring or ""
    lines = docstring.strip().split("\n")

    min_indent = len(docstring)
    for l in lines[1:]:
      l = l.rstrip()
      if l:
        i = 0
        while i < len(l) and l[i] == " ":
          i += 1
        if i < min_indent: min_indent = i
    for i in range(1, len(lines)):
      l = lines[i].rstrip()
      if len(l) >= min_indent:
        l = l[min_indent:]
      lines[i] = l
    return lines