###### tags: `kata`

# Exo-train kata

Given a string representation of a train, print an ASCII-art representation of this train.

* `H`: locomotive `<HHHH`
* `P`: passenger car `|OOOO|`

Cars are attached together by `::`

`HPP` ---> `<HHHH::|OOOO|::|OOOO|`

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* `R`: restaurant car `|hThT|`

`HPRP` ---> `<HHHH::|OOOO|::|hThT|::|OOOO|`

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* `H`: locomotive attached at the end `HHHH>`

`HPRPH` ---> `<HHHH::|OOOO|::|hThT|::|OOOO|::HHHH>`

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* A car can be deatached from the head or the end of the train

`HPRPH` ---> toASCIIart --->`<HHHH::|OOOO|::|hThT|::|OOOO|::HHHH>`
---> detachEnd ---> `<HHHH::|OOOO|::|hThT|::|OOOO|`
---> detachHead ---> `|OOOO|::|hThT|::|OOOO|`

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* `C`: cargo car `|____|` (when empty) `|^^^^|` (when full)

`HCCC` ---> `<HHHH::|____|::|____|::|____|`
---> fill ---> `<HHHH::|^^^^|::|____|::|____|`
---> fill ---> `<HHHH::|^^^^|::|^^^^|::|____|`
---> fill ---> `<HHHH::|^^^^|::|^^^^|::|^^^^|`
---> fill ---> error: cannot fill a full train

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