Conversions/OctalToDecimal: decimalToOctal uses float division (/= 8) so it emits spurious leading zeros / over-iterates

Description

Conversions/OctalToDecimal.php::decimalToOctal uses floating-point division for the quotient update, so the loop produces wrong output (spurious leading zeros and a near-infinite number of iterations) for essentially every input.

function decimalToOctal($decimalNumber)
{
    ...
    $octalNumber = '';
    while ($decimalNumber > 0) {
        $octalNumber = ($decimalNumber % 8) . $octalNumber;
        $decimalNumber /= 8;          // BUG: float division, not integer division
    }
    return $octalNumber;
}

In PHP, / returns a float whenever the operands are not evenly divisible, while % casts its operands to int. So once $decimalNumber drops below 8 the quotient becomes a fraction that stays > 0 for a very long time, and each extra iteration prepends (int)fraction % 8 == 0, i.e. a spurious '0'.

Trace for decimalToOctal(8) (correct answer: "10"):

• 8 % 8 = 0 → "0"; 8 / 8 = 1 (int, evenly divisible)
• 1 % 8 = 1 → "10"; 1 / 8 = 0.125 (float)
• 0.125 > 0 is still true → (int)0.125 % 8 = 0 → "010"; 0.125 / 8 = 0.015625
• … keeps prepending '0' until the float underflows to 0

So the result is "0…010" with a long run of leading zeros (and hundreds of wasted iterations), not "10". Every value that isn't reduced to exactly 0 by integer steps is affected.

Expected behavior

decimalToOctal(8) → "10", decimalToOctal(64) → "100", decimalToOctal(1) → "1".

Actual behavior

The quotient becomes fractional, the while ($decimalNumber > 0) loop over-runs, and the output gains spurious leading zeros (e.g. decimalToOctal(8) does not return "10").

Suggested fix

Use integer division for the quotient:

$decimalNumber = intdiv((int)$decimalNumber, 8);

(or $decimalNumber = (int)($decimalNumber / 8);). A test asserting decimalToOctal(8) === "10" and decimalToOctal(64) === "100" would guard this.

Start in Conversions/OctalToDecimal.php at decimalToOctal and inspect the quotient update inside its loop. Add coverage for decimalToOctal(8), decimalToOctal(64), and decimalToOctal(1), then run the relevant PHP test suite. Done means the conversions return "10", "100", and "1" without spurious leading zeros or excessive looping.