docstr: find the minimum node when node regard as a root node   
  :param node:
  :return: minimum node 
docstr_tok: ["find","the","minimum","node","when","node","regard","as","a","root","node",":","param","node",":",":","return",":","minimum","node"]
code: def minimum(self, node):
      """
      find the minimum node when node regard as a root node
      :param node:
      :return: minimum node
      """
      temp_node = node
      while temp_node.left:
          temp_node = temp_node.left
      return temp_node
  
file_path: keon-algos/algorithms/tree/red_black_tree/red_black_tree.py
label_desc: Use image node_id 8 for calling the RBTree obj's underlying member method code with example usage: obj.minimum(node) and returns: temp_node