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## crossword
### Instructions
Create the function `crosswordSolver` that is able to solve an empty crossword puzzle.
The function takes two arguments:
1. an empty puzzle, passed as a string and
2. a list of words to fill in the puzzle (no double words allowed)
The function must print on the console a string representing the puzzle filled with the input words.
The empty puzzle will be a string with the following rules:
- each character will be either a number, a `.` or a `\n` ;
- a number represent the number of words starting from the specific position and a `.` represent a space that does not need to be filled.
If the puzzle or list of words provided as inputs does not guarantee a unique solution, or any other conditions stated above are not met, the function must print `'Error'` .
### Examples
```js
const emptyPuzzle =
`2001
0..0
1000
0..0
`
const words = ['casa', 'alan', 'ciao', 'anta']
console.log(crosswordSolver(emptyPuzzle, words))
/* output:
`
casa
i..l
anta
o..n`
*/
```
