ascii_tree 0.1.1

generates ascii trees
Documentation 
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Crate to write an ascii tree.

```
 let l1 = Leaf(vec![String::from("line1"), String::from("line2"), String::from("line3"), String::from("line4")]);
 let l2 = Leaf(vec![String::from("only one line")]);
 let n1 = Node(String::from("node 1"), vec![l1.clone(), l2.clone()]);
 let n2 = Node(String::from("node 2"), vec![l2.clone(), l1.clone(), l2.clone()]);
 let n3 = Node(String::from("node 3"), vec![n1.clone(), l1.clone(), l2.clone()]);
 let n4 = Node(String::from("node 4"), vec![n1, n2, n3]);

 let mut output = String::new();
 let _ = write_tree(&mut output, &n4);
```

The result would be:
<pre>
 node 4
 ├─ node 1
 │  ├─ line1
 │  │  line2
 │  │  line3
 │  │  line4
 │  └─ only one line
 ├─ node 2
 │  ├─ only one line
 │  ├─ line1
 │  │  line2
 │  │  line3
 │  │  line4
 │  └─ only one line
 └─ node 3
    ├─ node 1
    │  ├─ line1
    │  │  line2
    │  │  line3
    │  │  line4
    │  └─ only one line
    ├─ line1
    │  line2
    │  line3
    │  line4
    └─ only one line
</pre>