StringCounter.sol

pragma solidity ^0.5.0;

contract StringCounter {
    function strlen(string memory s) internal pure returns (uint) {
        uint len;
        uint i = 0;
        uint bytelength = bytes(s).length;
        for(len = 0; i < bytelength; len++) {
            byte b = bytes(s)[i];
            if(b < 0x80) {
                i += 1;
            } else if (b < 0xE0) {
                i += 2;
            } else if (b < 0xF0) {
                i += 3;
            } else if (b < 0xF8) {
                i += 4;
            } else if (b < 0xFC) {
                i += 5;
            } else {
                i += 6;
            }
        }
        return len;
    }
    function valid(string memory name) public view returns(bool) {
        return strlen(name) > 6;
    }

    function length(string memory name) public view returns(uint) {
        return strlen(name);
    }
}