Solidity Convert to base

baseconvert.sol

    function convertToBase(uint N, uint8 base) public returns (uint) {
        if (N <= 0) return 0;

        uint index = 0;
        uint converted = 0;

        while (N >= base) {
            uint remainder = N % base;
            N = N / base;
            converted += remainder * (10** index++);
            if(N < base){
                converted += N * (10** index++);
            }
        }

        return converted;
    }