/// <summary>
/// Check for the two product numbers that only differs in one char and return the number without these char.
/// </summary>
/// <returns>The product number without the diffing char or an empty string if nothing was found.</returns>
/// <param name="numbers">A List of product numbers.</param>
public string Part2(string[] numbers)
{
foreach (string numberOne in numbers)
{
foreach (string numberTwo in numbers)
{
int pos = PartNumber.DiffOnOnePosition(numberOne, numberTwo);
if (pos != -1)
{
return(PartNumber.RemoveChar(numberOne, pos));
}
}
}
return(string.Empty);
}