CleanUnitString breaks on 0.2 and 0.3

[Gra-tak]

Pretty weird error and I can't fully tell what the intention in this section of code is, but

units::measurement_from_string("0.2") currently yields zero.

The reason is in the following lines in units.cpp. I don't know why 2 and 3 are a special case here, but I assume there is a case '.': missing in front of the break?

        auto eit = unit_string.end() - 1;
        if (*(eit) == '2' || *(eit) == '3') {
            if ((*(eit - 1) == '-' || *(eit - 1) == '+') &&
                unit_string.size() >= 3) {
                --eit;
            }
            if (!isDigitCharacter(*(eit - 1))) {
                switch (*(eit - 1)) {
                    case '^':
                    case 'e':
                    case 'E':
                    case '/':
                    case '+':
                    case '-':
                        break;
                    case '*':
                        *(eit - 1) = '^';
                        break;
                    default:
                        if (eit[0] != '+') {
                            unit_string.insert(eit, '^');
                        } else {
                            *eit = '^';
                        }

                        break;
                }
            }
        }
    }```

[phlptp]

Been on vacation for a couple weeks. Thanks for this It will be fixed shortly. The intention of that section of the code is to catch things like m3 which is often used for meter^3. Missed the edge cases of numerical values ending in .3 or .2