A tree structure   (i.e. a rooted, connected acyclic graph)   is often used in programming.

It's often helpful to visually examine such a structure.

There are many ways to represent trees to a reader, such as:

   indented text   (à la unix  tree  command)
   nested HTML tables
   hierarchical GUI widgets
   2D   or   3D   images
   etc.
Task

Write a program to produce a visual representation of some tree.

The content of the tree doesn't matter, nor does the output format, the only requirement being that the output is human friendly.

Make do with the vague term "friendly" the best you can.




using System;
 
public static class VisualizeTree
{
    public static void Main() {
        "A".t(
            "B0".t(
                "C1",
                "C2".t(
                    "D".t("E1", "E2", "E3")),
                "C3".t(
                    "F1",
                    "F2",
                    "F3".t("G"),
                    "F4".t("H1", "H2"))),
            "B1".t(
                "K1",
                "K2".t(
                    "L1".t("M"),
                    "L2",
                    "L3"),
                "K3")
        ).Print();
    }
 
    private static Tree t(this string value, params Tree[] children) => new Tree(value, children);
 
    private static void Print(this Tree tree) => tree.Print(true, "");
 
    private static void Print(this Tree tree, bool last, string prefix) {
        (string current, string next) = last
            ? (prefix + "└─" + tree.Value, prefix + "  ")
            : (prefix + "├─" + tree.Value, prefix + "| ");
        Console.WriteLine(current[2..]);
        for (int c = 0; c < tree.Children.Length; c++) {
            tree.Children[c].Print(c == tree.Children.Length - 1, next);
        }
    }
 
    class Tree
    {
        public Tree(string value, params Tree[] children) => (Value, Children) = (value, children);
        public static implicit operator Tree(string value) => new Tree(value);
        public string Value { get; }
        public Tree[] Children { get; }
    }
 
}