Luhn Calculator is a command-line utility to quickly validate a digit sequence using Luhn algorithm and calculate the next validation digit to be appended to the digit sequence to make whole sequence valid.
Validate the following invalid digit sequence 1234567890:
```bash
luhncalc 1234567890
Sequence: 1234567890 Valid sequence: false Next digit: 3 ```
Validate the following valid digit sequence 12345678903:
```bash
luhncalc 12345678903
Sequence: 12345678903 Valid sequence: true Next digit: 1 ```
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