tit

function uWei(uint v) internal pure returns (string memory) {
    if (v == 0) {
        return "0";
    }
    uint t = v;
    uint d;
    while (t != 0) {
        d++;
        t /= 10;
    }
    bytes memory buffer = new bytes(d);
    while (v != 0) {
        d -= 1;
        buffer[d] = bytes1(uint8(48 + v % 10));
        v /= 10;
    }
    return string(buffer);
}