Converts a flat-tree to a string. Adapted from mafintosh/print-flat-tree.
sh
$ cargo add print-flat-tree
```txt print-flat-tree Converts a flat-tree to a string
USAGE: print-flat-tree [tree]...
FLAGS: -h, --help Prints help information -V, --version Prints version information
ARGS:
```txt print-flat-tree 0 1 2 3 5 6 7 10 11
0──┐ 1──┐ 2──┘ │ 3──┐ │ │ │ 7 8──┐ │ 9──┐ │ 10──┘ │ │ 11──┘ 12──┐ │ 13──┘ 14──┘ ````