Non square puzzles sometimes crashes with an IndexOutOfRangeException

[sonnemaf]

If the puzzle is not square it sometimes crashes with an IndexOutOfRangeException.

Try this.

[Test]
public void CreateAndSolve()
{
    var pd = new WordSearchBuilder(20, 10)
    .WithWords("word1", "word2", "word3")
    .Build();

    var sol = new StandardWordSearchSolver();

    foreach (var word in pd.Solution)
    {
        var result = sol.SeekWord(pd.Puzzle, word.Word);
        result.First().Should().BeEquivalentTo(word);
    }
}