code: def _set_fills_in_color_layer(self, svg_string, color):
          
          structure = xmltodict.parse(svg_string)
          if color is None:
              return structure
          layers = structure["svg"]["g"]
          if not isinstance(layers, list):
              layers = [layers]
          for layer in layers:
              if not isinstance(layer, dict):
                  continue
              if layer.get("@inkscape:label") == "color" and \
                      layer.get("@inkscape:groupmode") == "layer":
                  for key, elements in layer.items():
                      if key.startswith("@") or key.startswith("#"):
                          continue
                      if not isinstance(elements, list):
                          elements = [elements]
                      for element in elements:
                          style = element.get("@style", None)
                          if style:
                              style = style.split(";")
                              processed_style = []
                              for style_element in style:
                                  if style_element.startswith("fill:"):
                                      style_element = "fill:" + color
                                  processed_style.append(style_element)
                              style = ";".join(processed_style)
                              element["@style"] = style
          return structure
docs: replaces fill colors in ``<g inkscape:label="color"
          inkscape:groupmode="layer">`` with :paramref:`color`
  
          :param color: a color fill the objects in the layer with