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Outline

• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
• library AddressUtils
•    - function isContract(address addr)
• interface ERC165
•    - function supportsInterface(bytes4 _in ...
•  contract SupportsInterfaceWithLook ...
•    - function supportsInterface(bytes4 _in ...
•    - function _registerInterface(bytes4 _i ...
•  contract ERC721Receiver
•    - function onERC721Received(
•  contract ERC721Basic is ERC165
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _o ...
•    - function isApprovedForAll(address _ow ...
•    - function transferFrom(address _from, ...
•    - function safeTransferFrom(address _fr ...
•    - function safeTransferFrom(
•  contract ERC721BasicToken is Suppo ...
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _t ...
•    - function isApprovedForAll(
•    - function transferFrom(
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function isApprovedOrOwner(
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•    - function clearApproval(address _owner ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function checkAndCallSafeTransfer(
•  contract ERC721Enumerable is ERC72 ...
•    - function totalSupply()
•    - function tokenOfOwnerByIndex(
•    - function tokenByIndex(uint256 _index)
•  contract ERC721Metadata is ERC721B ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•  contract ERC721 is ERC721Basic, ER ...
•  contract ERC721Token is SupportsIn ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•    - function tokenOfOwnerByIndex(
•    - function totalSupply()
•    - function tokenByIndex(uint256 _index)
•    - function _setTokenURI(uint256 _tokenI ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•  contract Ownable
•    - function renounceOwnership()
•    - function transferOwnership(address _n ...
•    - function _transferOwnership(address _ ...
• library Roles
•    - function add(Role storage role, addre ...
•    - function remove(Role storage role, ad ...
•    - function check(Role storage role, add ...
•    - function has(Role storage role, addre ...
•  contract RBAC
•    - function checkRole(address _operator, ...
•    - function hasRole(address _operator, s ...
•    - function addRole(address _operator, s ...
•    - function removeRole(address _operator ...
•  contract Whitelist is Ownable, RBA ...
•    - function addAddressToWhitelist(addres ...
•    - function whitelist(address _operator)
•    - function addAddressesToWhitelist(addr ...
•    - function removeAddressFromWhitelist(a ...
•    - function removeAddressesFromWhitelist ...
•  contract CrabData
•    - function arrayToCrabPartData(
•    - function crabPartDataToArray(CrabPart ...
•  contract GeneSurgeon
•    - function extractElementsFromGene(uint ...
•    - function extractPartsFromGene(uint256 ...
•  contract CryptantCrabNFT is ERC721 ... *
•    - function tokenURI(uint256 _tokenId)
•    - function dataOfPart(uint256 _partInde ...
•    - function giftToken(address _from, add ...
•    - function mintToken(address _tokenOwne ...
•    - function crabPartDataFromGene(uint256 ...
•    - function setPartData(uint256 _partInd ...
•    - function setDefaultMetadataURI(string ...
•    - function setTokenURI(uint256 _tokenId ...
•    - function specialSkinOfTokenId(uint256 ...
•    - function initiateCrabPartData()
•    - function isApprovedOrOwner(address _s ...
•    - function getMetadataURL(bytes _uri, u ...

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/**
 *Submitted for verification at Etherscan.io on 2018-10-25
*/

pragma solidity 0.4.24;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether the target address is a contract
   * @dev This function will return false if invoked during the constructor of a contract,
   * as the code is not actually created until after the constructor finishes.
   * @param addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address addr) internal view returns (bool) {
    uint256 size;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603
    // for more details about how this works.
    // TODO Check this again before the Serenity release, because all addresses will be
    // contracts then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(addr) }
    return size > 0;
  }

}

/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface ERC165 {

  /**
   * @notice Query if a contract implements an interface
   * @param _interfaceId The interface identifier, as specified in ERC-165
   * @dev Interface identification is specified in ERC-165. This function
   * uses less than 30,000 gas.
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool);
}


/**
 * @title SupportsInterfaceWithLookup
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract SupportsInterfaceWithLookup is ERC165 {
  bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
  /**
   * 0x01ffc9a7 ===
   *   bytes4(keccak256('supportsInterface(bytes4)'))
   */

  /**
   * @dev a mapping of interface id to whether or not it's supported
   */
  mapping(bytes4 => bool) internal supportedInterfaces;

  /**
   * @dev A contract implementing SupportsInterfaceWithLookup
   * implement ERC165 itself
   */
  constructor()
    public
  {
    _registerInterface(InterfaceId_ERC165);
  }

  /**
   * @dev implement supportsInterface(bytes4) using a lookup table
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool)
  {
    return supportedInterfaces[_interfaceId];
  }

  /**
   * @dev private method for registering an interface
   */
  function _registerInterface(bytes4 _interfaceId)
    internal
  {
    require(_interfaceId != 0xffffffff);
    supportedInterfaces[_interfaceId] = true;
  }
}

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract ERC721Receiver {
  /**
   * @dev Magic value to be returned upon successful reception of an NFT
   *  Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;

  /**
   * @notice Handle the receipt of an NFT
   * @dev The ERC721 smart contract calls this function on the recipient
   * after a `safetransfer`. This function MAY throw to revert and reject the
   * transfer. Return of other than the magic value MUST result in the 
   * transaction being reverted.
   * Note: the contract address is always the message sender.
   * @param _operator The address which called `safeTransferFrom` function
   * @param _from The address which previously owned the token
   * @param _tokenId The NFT identifier which is being transfered
   * @param _data Additional data with no specified format
   * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
   */
  function onERC721Received(
    address _operator,
    address _from,
    uint256 _tokenId,
    bytes _data
  )
    public
    returns(bytes4);
}

/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Basic is ERC165 {
  event Transfer(
    address indexed _from,
    address indexed _to,
    uint256 indexed _tokenId
  );
  event Approval(
    address indexed _owner,
    address indexed _approved,
    uint256 indexed _tokenId
  );
  event ApprovalForAll(
    address indexed _owner,
    address indexed _operator,
    bool _approved
  );

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function exists(uint256 _tokenId) public view returns (bool _exists);

  function approve(address _to, uint256 _tokenId) public;
  function getApproved(uint256 _tokenId)
    public view returns (address _operator);

  function setApprovalForAll(address _operator, bool _approved) public;
  function isApprovedForAll(address _owner, address _operator)
    public view returns (bool);

  function transferFrom(address _from, address _to, uint256 _tokenId) public;
  function safeTransferFrom(address _from, address _to, uint256 _tokenId)
    public;

  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    public;
}

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic {

  bytes4 private constant InterfaceId_ERC721 = 0x80ac58cd;
  /*
   * 0x80ac58cd ===
   *   bytes4(keccak256('balanceOf(address)')) ^
   *   bytes4(keccak256('ownerOf(uint256)')) ^
   *   bytes4(keccak256('approve(address,uint256)')) ^
   *   bytes4(keccak256('getApproved(uint256)')) ^
   *   bytes4(keccak256('setApprovalForAll(address,bool)')) ^
   *   bytes4(keccak256('isApprovedForAll(address,address)')) ^
   *   bytes4(keccak256('transferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
   */

  bytes4 private constant InterfaceId_ERC721Exists = 0x4f558e79;
  /*
   * 0x4f558e79 ===
   *   bytes4(keccak256('exists(uint256)'))
   */

  using SafeMath for uint256;
  using AddressUtils for address;

  // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 private constant ERC721_RECEIVED = 0x150b7a02;

  // Mapping from token ID to owner
  mapping (uint256 => address) internal tokenOwner;

  // Mapping from token ID to approved address
  mapping (uint256 => address) internal tokenApprovals;

  // Mapping from owner to number of owned token
  mapping (address => uint256) internal ownedTokensCount;

  // Mapping from owner to operator approvals
  mapping (address => mapping (address => bool)) internal operatorApprovals;

  /**
   * @dev Guarantees msg.sender is owner of the given token
   * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
   */
  modifier onlyOwnerOf(uint256 _tokenId) {
    require(ownerOf(_tokenId) == msg.sender);
    _;
  }

  /**
   * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
   * @param _tokenId uint256 ID of the token to validate
   */
  modifier canTransfer(uint256 _tokenId) {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    _;
  }

  constructor()
    public
  {
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721);
    _registerInterface(InterfaceId_ERC721Exists);
  }

  /**
   * @dev Gets the balance of the specified address
   * @param _owner address to query the balance of
   * @return uint256 representing the amount owned by the passed address
   */
  function balanceOf(address _owner) public view returns (uint256) {
    require(_owner != address(0));
    return ownedTokensCount[_owner];
  }

  /**
   * @dev Gets the owner of the specified token ID
   * @param _tokenId uint256 ID of the token to query the owner of
   * @return owner address currently marked as the owner of the given token ID
   */
  function ownerOf(uint256 _tokenId) public view returns (address) {
    address owner = tokenOwner[_tokenId];
    require(owner != address(0));
    return owner;
  }

  /**
   * @dev Returns whether the specified token exists
   * @param _tokenId uint256 ID of the token to query the existence of
   * @return whether the token exists
   */
  function exists(uint256 _tokenId) public view returns (bool) {
    address owner = tokenOwner[_tokenId];
    return owner != address(0);
  }

  /**
   * @dev Approves another address to transfer the given token ID
   * The zero address indicates there is no approved address.
   * There can only be one approved address per token at a given time.
   * Can only be called by the token owner or an approved operator.
   * @param _to address to be approved for the given token ID
   * @param _tokenId uint256 ID of the token to be approved
   */
  function approve(address _to, uint256 _tokenId) public {
    address owner = ownerOf(_tokenId);
    require(_to != owner);
    require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

    tokenApprovals[_tokenId] = _to;
    emit Approval(owner, _to, _tokenId);
  }

  /**
   * @dev Gets the approved address for a token ID, or zero if no address set
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return address currently approved for the given token ID
   */
  function getApproved(uint256 _tokenId) public view returns (address) {
    return tokenApprovals[_tokenId];
  }

  /**
   * @dev Sets or unsets the approval of a given operator
   * An operator is allowed to transfer all tokens of the sender on their behalf
   * @param _to operator address to set the approval
   * @param _approved representing the status of the approval to be set
   */
  function setApprovalForAll(address _to, bool _approved) public {
    require(_to != msg.sender);
    operatorApprovals[msg.sender][_to] = _approved;
    emit ApprovalForAll(msg.sender, _to, _approved);
  }

  /**
   * @dev Tells whether an operator is approved by a given owner
   * @param _owner owner address which you want to query the approval of
   * @param _operator operator address which you want to query the approval of
   * @return bool whether the given operator is approved by the given owner
   */
  function isApprovedForAll(
    address _owner,
    address _operator
  )
    public
    view
    returns (bool)
  {
    return operatorApprovals[_owner][_operator];
  }

  /**
   * @dev Transfers the ownership of a given token ID to another address
   * Usage of this method is discouraged, use `safeTransferFrom` whenever possible
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
  */
  function transferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  )
    public
    canTransfer(_tokenId)
  {
    require(_from != address(0));
    require(_to != address(0));

    clearApproval(_from, _tokenId);
    removeTokenFrom(_from, _tokenId);
    addTokenTo(_to, _tokenId);

    emit Transfer(_from, _to, _tokenId);
  }

  /**
   * @dev Safely transfers the ownership of a given token ID to another address
   * If the target address is a contract, it must implement `onERC721Received`,
   * which is called upon a safe transfer, and return the magic value
   * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
   * the transfer is reverted.
   *
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
  */
  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  )
    public
    canTransfer(_tokenId)
  {
    // solium-disable-next-line arg-overflow
    safeTransferFrom(_from, _to, _tokenId, "");
  }

  /**
   * @dev Safely transfers the ownership of a given token ID to another address
   * If the target address is a contract, it must implement `onERC721Received`,
   * which is called upon a safe transfer, and return the magic value
   * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
   * the transfer is reverted.
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
   * @param _data bytes data to send along with a safe transfer check
   */
  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    public
    canTransfer(_tokenId)
  {
    transferFrom(_from, _to, _tokenId);
    // solium-disable-next-line arg-overflow
    require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
  }

  /**
   * @dev Returns whether the given spender can transfer a given token ID
   * @param _spender address of the spender to query
   * @param _tokenId uint256 ID of the token to be transferred
   * @return bool whether the msg.sender is approved for the given token ID,
   *  is an operator of the owner, or is the owner of the token
   */
  function isApprovedOrOwner(
    address _spender,
    uint256 _tokenId
  )
    internal
    view
    returns (bool)
  {
    address owner = ownerOf(_tokenId);
    // Disable solium check because of
    // https://github.com/duaraghav8/Solium/issues/175
    // solium-disable-next-line operator-whitespace
    return (
      _spender == owner ||
      getApproved(_tokenId) == _spender ||
      isApprovedForAll(owner, _spender)
    );
  }

  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to The address that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   */
  function _mint(address _to, uint256 _tokenId) internal {
    require(_to != address(0));
    addTokenTo(_to, _tokenId);
    emit Transfer(address(0), _to, _tokenId);
  }

  /**
   * @dev Internal function to burn a specific token
   * Reverts if the token does not exist
   * @param _tokenId uint256 ID of the token being burned by the msg.sender
   */
  function _burn(address _owner, uint256 _tokenId) internal {
    clearApproval(_owner, _tokenId);
    removeTokenFrom(_owner, _tokenId);
    emit Transfer(_owner, address(0), _tokenId);
  }

  /**
   * @dev Internal function to clear current approval of a given token ID
   * Reverts if the given address is not indeed the owner of the token
   * @param _owner owner of the token
   * @param _tokenId uint256 ID of the token to be transferred
   */
  function clearApproval(address _owner, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _owner);
    if (tokenApprovals[_tokenId] != address(0)) {
      tokenApprovals[_tokenId] = address(0);
    }
  }

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    require(tokenOwner[_tokenId] == address(0));
    tokenOwner[_tokenId] = _to;
    ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _from);
    ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
    tokenOwner[_tokenId] = address(0);
  }

  /**
   * @dev Internal function to invoke `onERC721Received` on a target address
   * The call is not executed if the target address is not a contract
   * @param _from address representing the previous owner of the given token ID
   * @param _to target address that will receive the tokens
   * @param _tokenId uint256 ID of the token to be transferred
   * @param _data bytes optional data to send along with the call
   * @return whether the call correctly returned the expected magic value
   */
  function checkAndCallSafeTransfer(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    internal
    returns (bool)
  {
    if (!_to.isContract()) {
      return true;
    }
    bytes4 retval = ERC721Receiver(_to).onERC721Received(
      msg.sender, _from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}



/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Enumerable is ERC721Basic {
  function totalSupply() public view returns (uint256);
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256 _tokenId);

  function tokenByIndex(uint256 _index) public view returns (uint256);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Metadata is ERC721Basic {
  function name() external view returns (string _name);
  function symbol() external view returns (string _symbol);
  function tokenURI(uint256 _tokenId) public view returns (string);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, full implementation interface
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}

/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {

  bytes4 private constant InterfaceId_ERC721Enumerable = 0x780e9d63;
  /**
   * 0x780e9d63 ===
   *   bytes4(keccak256('totalSupply()')) ^
   *   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
   *   bytes4(keccak256('tokenByIndex(uint256)'))
   */

  bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f;
  /**
   * 0x5b5e139f ===
   *   bytes4(keccak256('name()')) ^
   *   bytes4(keccak256('symbol()')) ^
   *   bytes4(keccak256('tokenURI(uint256)'))
   */

  // Token name
  string internal name_;

  // Token symbol
  string internal symbol_;

  // Mapping from owner to list of owned token IDs
  mapping(address => uint256[]) internal ownedTokens;

  // Mapping from token ID to index of the owner tokens list
  mapping(uint256 => uint256) internal ownedTokensIndex;

  // Array with all token ids, used for enumeration
  uint256[] internal allTokens;

  // Mapping from token id to position in the allTokens array
  mapping(uint256 => uint256) internal allTokensIndex;

  // Optional mapping for token URIs
  mapping(uint256 => string) internal tokenURIs;

  /**
   * @dev Constructor function
   */
  constructor(string _name, string _symbol) public {
    name_ = _name;
    symbol_ = _symbol;

    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721Enumerable);
    _registerInterface(InterfaceId_ERC721Metadata);
  }

  /**
   * @dev Gets the token name
   * @return string representing the token name
   */
  function name() external view returns (string) {
    return name_;
  }

  /**
   * @dev Gets the token symbol
   * @return string representing the token symbol
   */
  function symbol() external view returns (string) {
    return symbol_;
  }

  /**
   * @dev Returns an URI for a given token ID
   * Throws if the token ID does not exist. May return an empty string.
   * @param _tokenId uint256 ID of the token to query
   */
  function tokenURI(uint256 _tokenId) public view returns (string) {
    require(exists(_tokenId));
    return tokenURIs[_tokenId];
  }

  /**
   * @dev Gets the token ID at a given index of the tokens list of the requested owner
   * @param _owner address owning the tokens list to be accessed
   * @param _index uint256 representing the index to be accessed of the requested tokens list
   * @return uint256 token ID at the given index of the tokens list owned by the requested address
   */
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256)
  {
    require(_index < balanceOf(_owner));
    return ownedTokens[_owner][_index];
  }

  /**
   * @dev Gets the total amount of tokens stored by the contract
   * @return uint256 representing the total amount of tokens
   */
  function totalSupply() public view returns (uint256) {
    return allTokens.length;
  }

  /**
   * @dev Gets the token ID at a given index of all the tokens in this contract
   * Reverts if the index is greater or equal to the total number of tokens
   * @param _index uint256 representing the index to be accessed of the tokens list
   * @return uint256 token ID at the given index of the tokens list
   */
  function tokenByIndex(uint256 _index) public view returns (uint256) {
    require(_index < totalSupply());
    return allTokens[_index];
  }

  /**
   * @dev Internal function to set the token URI for a given token
   * Reverts if the token ID does not exist
   * @param _tokenId uint256 ID of the token to set its URI
   * @param _uri string URI to assign
   */
  function _setTokenURI(uint256 _tokenId, string _uri) internal {
    require(exists(_tokenId));
    tokenURIs[_tokenId] = _uri;
  }

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    super.addTokenTo(_to, _tokenId);
    uint256 length = ownedTokens[_to].length;
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    super.removeTokenFrom(_from, _tokenId);

    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    ownedTokens[_from][lastTokenIndex] = 0;
    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list

    ownedTokens[_from].length--;
    ownedTokensIndex[_tokenId] = 0;
    ownedTokensIndex[lastToken] = tokenIndex;
  }

  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to address the beneficiary that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   */
  function _mint(address _to, uint256 _tokenId) internal {
    super._mint(_to, _tokenId);

    allTokensIndex[_tokenId] = allTokens.length;
    allTokens.push(_tokenId);
  }

  /**
   * @dev Internal function to burn a specific token
   * Reverts if the token does not exist
   * @param _owner owner of the token to burn
   * @param _tokenId uint256 ID of the token being burned by the msg.sender
   */
  function _burn(address _owner, uint256 _tokenId) internal {
    super._burn(_owner, _tokenId);

    // Clear metadata (if any)
    if (bytes(tokenURIs[_tokenId]).length != 0) {
      delete tokenURIs[_tokenId];
    }

    // Reorg all tokens array
    uint256 tokenIndex = allTokensIndex[_tokenId];
    uint256 lastTokenIndex = allTokens.length.sub(1);
    uint256 lastToken = allTokens[lastTokenIndex];

    allTokens[tokenIndex] = lastToken;
    allTokens[lastTokenIndex] = 0;

    allTokens.length--;
    allTokensIndex[_tokenId] = 0;
    allTokensIndex[lastToken] = tokenIndex;
  }

}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

/**
 * @title Roles
 * @author Francisco Giordano (@frangio)
 * @dev Library for managing addresses assigned to a Role.
 * See RBAC.sol for example usage.
 */
library Roles {
  struct Role {
    mapping (address => bool) bearer;
  }

  /**
   * @dev give an address access to this role
   */
  function add(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = true;
  }

  /**
   * @dev remove an address' access to this role
   */
  function remove(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = false;
  }

  /**
   * @dev check if an address has this role
   * // reverts
   */
  function check(Role storage role, address addr)
    view
    internal
  {
    require(has(role, addr));
  }

  /**
   * @dev check if an address has this role
   * @return bool
   */
  function has(Role storage role, address addr)
    view
    internal
    returns (bool)
  {
    return role.bearer[addr];
  }
}


/**
 * @title RBAC (Role-Based Access Control)
 * @author Matt Condon (@Shrugs)
 * @dev Stores and provides setters and getters for roles and addresses.
 * Supports unlimited numbers of roles and addresses.
 * See //contracts/mocks/RBACMock.sol for an example of usage.
 * This RBAC method uses strings to key roles. It may be beneficial
 * for you to write your own implementation of this interface using Enums or similar.
 * It's also recommended that you define constants in the contract, like ROLE_ADMIN below,
 * to avoid typos.
 */
contract RBAC {
  using Roles for Roles.Role;

  mapping (string => Roles.Role) private roles;

  event RoleAdded(address indexed operator, string role);
  event RoleRemoved(address indexed operator, string role);

  /**
   * @dev reverts if addr does not have role
   * @param _operator address
   * @param _role the name of the role
   * // reverts
   */
  function checkRole(address _operator, string _role)
    view
    public
  {
    roles[_role].check(_operator);
  }

  /**
   * @dev determine if addr has role
   * @param _operator address
   * @param _role the name of the role
   * @return bool
   */
  function hasRole(address _operator, string _role)
    view
    public
    returns (bool)
  {
    return roles[_role].has(_operator);
  }

  /**
   * @dev add a role to an address
   * @param _operator address
   * @param _role the name of the role
   */
  function addRole(address _operator, string _role)
    internal
  {
    roles[_role].add(_operator);
    emit RoleAdded(_operator, _role);
  }

  /**
   * @dev remove a role from an address
   * @param _operator address
   * @param _role the name of the role
   */
  function removeRole(address _operator, string _role)
    internal
  {
    roles[_role].remove(_operator);
    emit RoleRemoved(_operator, _role);
  }

  /**
   * @dev modifier to scope access to a single role (uses msg.sender as addr)
   * @param _role the name of the role
   * // reverts
   */
  modifier onlyRole(string _role)
  {
    checkRole(msg.sender, _role);
    _;
  }

  /**
   * @dev modifier to scope access to a set of roles (uses msg.sender as addr)
   * @param _roles the names of the roles to scope access to
   * // reverts
   *
   * @TODO - when solidity supports dynamic arrays as arguments to modifiers, provide this
   *  see: https://github.com/ethereum/solidity/issues/2467
   */
  // modifier onlyRoles(string[] _roles) {
  //     bool hasAnyRole = false;
  //     for (uint8 i = 0; i < _roles.length; i++) {
  //         if (hasRole(msg.sender, _roles[i])) {
  //             hasAnyRole = true;
  //             break;
  //         }
  //     }

  //     require(hasAnyRole);

  //     _;
  // }
}

/**
 * @title Whitelist
 * @dev The Whitelist contract has a whitelist of addresses, and provides basic authorization control functions.
 * This simplifies the implementation of "user permissions".
 */
contract Whitelist is Ownable, RBAC {
  string public constant ROLE_WHITELISTED = "whitelist";

  /**
   * @dev Throws if operator is not whitelisted.
   * @param _operator address
   */
  modifier onlyIfWhitelisted(address _operator) {
    checkRole(_operator, ROLE_WHITELISTED);
    _;
  }

  /**
   * @dev add an address to the whitelist
   * @param _operator address
   * @return true if the address was added to the whitelist, false if the address was already in the whitelist
   */
  function addAddressToWhitelist(address _operator)
    onlyOwner
    public
  {
    addRole(_operator, ROLE_WHITELISTED);
  }

  /**
   * @dev getter to determine if address is in whitelist
   */
  function whitelist(address _operator)
    public
    view
    returns (bool)
  {
    return hasRole(_operator, ROLE_WHITELISTED);
  }

  /**
   * @dev add addresses to the whitelist
   * @param _operators addresses
   * @return true if at least one address was added to the whitelist,
   * false if all addresses were already in the whitelist
   */
  function addAddressesToWhitelist(address[] _operators)
    onlyOwner
    public
  {
    for (uint256 i = 0; i < _operators.length; i++) {
      addAddressToWhitelist(_operators[i]);
    }
  }

  /**
   * @dev remove an address from the whitelist
   * @param _operator address
   * @return true if the address was removed from the whitelist,
   * false if the address wasn't in the whitelist in the first place
   */
  function removeAddressFromWhitelist(address _operator)
    onlyOwner
    public
  {
    removeRole(_operator, ROLE_WHITELISTED);
  }

  /**
   * @dev remove addresses from the whitelist
   * @param _operators addresses
   * @return true if at least one address was removed from the whitelist,
   * false if all addresses weren't in the whitelist in the first place
   */
  function removeAddressesFromWhitelist(address[] _operators)
    onlyOwner
    public
  {
    for (uint256 i = 0; i < _operators.length; i++) {
      removeAddressFromWhitelist(_operators[i]);
    }
  }

}

contract CrabData {
  modifier crabDataLength(uint256[] memory _crabData) {
    require(_crabData.length == 8);
    _;
  }

  struct CrabPartData {
    uint256 hp;
    uint256 dps;
    uint256 blockRate;
    uint256 resistanceBonus;
    uint256 hpBonus;
    uint256 dpsBonus;
    uint256 blockBonus;
    uint256 mutiplierBonus;
  }

  function arrayToCrabPartData(
    uint256[] _partData
  ) 
    internal 
    pure 
    crabDataLength(_partData) 
    returns (CrabPartData memory _parsedData) 
  {
    _parsedData = CrabPartData(
      _partData[0],   // hp
      _partData[1],   // dps
      _partData[2],   // block rate
      _partData[3],   // resistance bonus
      _partData[4],   // hp bonus
      _partData[5],   // dps bonus
      _partData[6],   // block bonus
      _partData[7]);  // multiplier bonus
  }

  function crabPartDataToArray(CrabPartData _crabPartData) internal pure returns (uint256[] memory _resultData) {
    _resultData = new uint256[](8);
    _resultData[0] = _crabPartData.hp;
    _resultData[1] = _crabPartData.dps;
    _resultData[2] = _crabPartData.blockRate;
    _resultData[3] = _crabPartData.resistanceBonus;
    _resultData[4] = _crabPartData.hpBonus;
    _resultData[5] = _crabPartData.dpsBonus;
    _resultData[6] = _crabPartData.blockBonus;
    _resultData[7] = _crabPartData.mutiplierBonus;
  }
}


contract GeneSurgeon {
  //0 - filler, 1 - body, 2 - leg, 3 - left claw, 4 - right claw
  uint256[] internal crabPartMultiplier = [0, 10**9, 10**6, 10**3, 1];

  function extractElementsFromGene(uint256 _gene) internal view returns (uint256[] memory _elements) {
    _elements = new uint256[](4);
    _elements[0] = _gene / crabPartMultiplier[1] / 100 % 10;
    _elements[1] = _gene / crabPartMultiplier[2] / 100 % 10;
    _elements[2] = _gene / crabPartMultiplier[3] / 100 % 10;
    _elements[3] = _gene / crabPartMultiplier[4] / 100 % 10;
  }

  function extractPartsFromGene(uint256 _gene) internal view returns (uint256[] memory _parts) {
    _parts = new uint256[](4);
    _parts[0] = _gene / crabPartMultiplier[1] % 100;
    _parts[1] = _gene / crabPartMultiplier[2] % 100;
    _parts[2] = _gene / crabPartMultiplier[3] % 100;
    _parts[3] = _gene / crabPartMultiplier[4] % 100;
  }
}

contract CryptantCrabNFT is ERC721Token, Whitelist, CrabData, GeneSurgeon {
  event CrabPartAdded(uint256 hp, uint256 dps, uint256 blockAmount);
  event GiftTransfered(address indexed _from, address indexed _to, uint256 indexed _tokenId);
  event DefaultMetadataURIChanged(string newUri);

  /**
   * @dev Pre-generated keys to save gas
   * keys are generated with:
   * CRAB_BODY       = bytes4(keccak256("crab_body"))       = 0xc398430e
   * CRAB_LEG        = bytes4(keccak256("crab_leg"))        = 0x889063b1
   * CRAB_LEFT_CLAW  = bytes4(keccak256("crab_left_claw"))  = 0xdb6290a2
   * CRAB_RIGHT_CLAW = bytes4(keccak256("crab_right_claw")) = 0x13453f89
   */
  bytes4 internal constant CRAB_BODY = 0xc398430e;
  bytes4 internal constant CRAB_LEG = 0x889063b1;
  bytes4 internal constant CRAB_LEFT_CLAW = 0xdb6290a2;
  bytes4 internal constant CRAB_RIGHT_CLAW = 0x13453f89;

  /**
   * @dev Stores all the crab data
   */
  mapping(bytes4 => mapping(uint256 => CrabPartData[])) internal crabPartData;

  /**
   * @dev Mapping from tokenId to its corresponding special skin
   * tokenId with default skin will not be stored. 
   */
  mapping(uint256 => uint256) internal crabSpecialSkins;

  /**
   * @dev default MetadataURI
   */
  string public defaultMetadataURI = "https://www.cryptantcrab.io/md/";

  constructor(string _name, string _symbol) public ERC721Token(_name, _symbol) {
    // constructor
    initiateCrabPartData();
  }

  /**
   * @dev Returns an URI for a given token ID
   * Throws if the token ID does not exist.
   * Will return the token's metadata URL if it has one, 
   * otherwise will just return base on the default metadata URI
   * @param _tokenId uint256 ID of the token to query
   */
  function tokenURI(uint256 _tokenId) public view returns (string) {
    require(exists(_tokenId));

    string memory _uri = tokenURIs[_tokenId];

    if(bytes(_uri).length == 0) {
      _uri = getMetadataURL(bytes(defaultMetadataURI), _tokenId);
    }

    return _uri;
  }

  /**
   * @dev Returns the data of a specific parts
   * @param _partIndex the part to retrieve. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw
   * @param _element the element of part to retrieve. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water
   * @param _setIndex the set index of for the specified part. This will starts from 1.
   */
  function dataOfPart(uint256 _partIndex, uint256 _element, uint256 _setIndex) public view returns (uint256[] memory _resultData) {
    bytes4 _key;
    if(_partIndex == 1) {
      _key = CRAB_BODY;
    } else if(_partIndex == 2) {
      _key = CRAB_LEG;
    } else if(_partIndex == 3) {
      _key = CRAB_LEFT_CLAW;
    } else if(_partIndex == 4) {
      _key = CRAB_RIGHT_CLAW;
    } else {
      revert();
    }

    CrabPartData storage _crabPartData = crabPartData[_key][_element][_setIndex];

    _resultData = crabPartDataToArray(_crabPartData);
  }

  /**
   * @dev Gift(Transfer) a token to another address. Caller must be token owner
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
   */
  function giftToken(address _from, address _to, uint256 _tokenId) external {
    safeTransferFrom(_from, _to, _tokenId);

    emit GiftTransfered(_from, _to, _tokenId);
  }

  /**
   * @dev External function to mint a new token, for whitelisted address only.
   * Reverts if the given token ID already exists
   * @param _tokenOwner address the beneficiary that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   * @param _skinId the skin ID to be applied for all the token minted
   */
  function mintToken(address _tokenOwner, uint256 _tokenId, uint256 _skinId) external onlyIfWhitelisted(msg.sender) {
    super._mint(_tokenOwner, _tokenId);

    if(_skinId > 0) {
      crabSpecialSkins[_tokenId] = _skinId;
    }
  }

  /**
   * @dev Returns crab data base on the gene provided
   * @param _gene the gene info where crab data will be retrieved base on it
   * @return 4 uint arrays:
   * 1st Array = Body's Data
   * 2nd Array = Leg's Data
   * 3rd Array = Left Claw's Data
   * 4th Array = Right Claw's Data
   */
  function crabPartDataFromGene(uint256 _gene) external view returns (
    uint256[] _bodyData,
    uint256[] _legData,
    uint256[] _leftClawData,
    uint256[] _rightClawData
  ) {
    uint256[] memory _parts = extractPartsFromGene(_gene);
    uint256[] memory _elements = extractElementsFromGene(_gene);

    _bodyData = dataOfPart(1, _elements[0], _parts[0]);
    _legData = dataOfPart(2, _elements[1], _parts[1]);
    _leftClawData = dataOfPart(3, _elements[2], _parts[2]);
    _rightClawData = dataOfPart(4, _elements[3], _parts[3]);
  }

  /**
   * @dev For developer to add new parts, notice that this is the only method to add crab data
   * so that developer can add extra content. there's no other method for developer to modify
   * the data. This is to assure token owner actually owns their data.
   * @param _partIndex the part to add. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw
   * @param _element the element of part to add. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water
   * @param _partDataArray data of the parts.
   */
  function setPartData(uint256 _partIndex, uint256 _element, uint256[] _partDataArray) external onlyOwner {
    CrabPartData memory _partData = arrayToCrabPartData(_partDataArray);

    bytes4 _key;
    if(_partIndex == 1) {
      _key = CRAB_BODY;
    } else if(_partIndex == 2) {
      _key = CRAB_LEG;
    } else if(_partIndex == 3) {
      _key = CRAB_LEFT_CLAW;
    } else if(_partIndex == 4) {
      _key = CRAB_RIGHT_CLAW;
    }

    // if index 1 is empty will fill at index 1
    if(crabPartData[_key][_element][1].hp == 0 && crabPartData[_key][_element][1].dps == 0) {
      crabPartData[_key][_element][1] = _partData;
    } else {
      crabPartData[_key][_element].push(_partData);
    }

    emit CrabPartAdded(_partDataArray[0], _partDataArray[1], _partDataArray[2]);
  }

  /**
   * @dev Updates the default metadata URI
   * @param _defaultUri the new metadata URI
   */
  function setDefaultMetadataURI(string _defaultUri) external onlyOwner {
    defaultMetadataURI = _defaultUri;

    emit DefaultMetadataURIChanged(_defaultUri);
  }

  /**
   * @dev Updates the metadata URI for existing token
   * @param _tokenId the tokenID that metadata URI to be changed
   * @param _uri the new metadata URI for the specified token
   */
  function setTokenURI(uint256 _tokenId, string _uri) external onlyIfWhitelisted(msg.sender) {
    _setTokenURI(_tokenId, _uri);
  }

  /**
   * @dev Returns the special skin of the provided tokenId
   * @param _tokenId cryptant crab's tokenId
   * @return Special skin belongs to the _tokenId provided. 
   * 0 will be returned if no special skin found.
   */
  function specialSkinOfTokenId(uint256 _tokenId) external view returns (uint256) {
    return crabSpecialSkins[_tokenId];
  }

  /**
   * @dev This functions will adjust the length of crabPartData
   * so that when adding data the index can start with 1.
   * Reason of doing this is because gene cannot have parts with index 0.
   */
  function initiateCrabPartData() internal {
    require(crabPartData[CRAB_BODY][1].length == 0);

    for(uint256 i = 1 ; i <= 5 ; i++) {
      crabPartData[CRAB_BODY][i].length = 2;
      crabPartData[CRAB_LEG][i].length = 2;
      crabPartData[CRAB_LEFT_CLAW][i].length = 2;
      crabPartData[CRAB_RIGHT_CLAW][i].length = 2;
    }
  }

  /**
   * @dev Returns whether the given spender can transfer a given token ID
   * @param _spender address of the spender to query
   * @param _tokenId uint256 ID of the token to be transferred
   * @return bool whether the msg.sender is approved for the given token ID,
   *  is an operator of the owner, or is the owner of the token, 
   *  or has been whitelisted by contract owner
   */
  function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
    address owner = ownerOf(_tokenId);
    return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender) || whitelist(_spender);
  }

  /**
   * @dev Will merge the uri and tokenId together. 
   * @param _uri URI to be merge. This will be the first part of the result URL.
   * @param _tokenId tokenID to be merge. This will be the last part of the result URL.
   * @return the merged urL
   */
  function getMetadataURL(bytes _uri, uint256 _tokenId) internal pure returns (string) {
    uint256 _tmpTokenId = _tokenId;
    uint256 _tokenLength;

    // Getting the length(number of digits) of token ID
    do {
      _tokenLength++;
      _tmpTokenId /= 10;
    } while (_tmpTokenId > 0);

    // creating a byte array with the length of URL + token digits
    bytes memory _result = new bytes(_uri.length + _tokenLength);

    // cloning the uri bytes into the result bytes
    for(uint256 i = 0 ; i < _uri.length ; i ++) {
      _result[i] = _uri[i];
    }

    // appending the tokenId to the end of the result bytes
    uint256 lastIndex = _result.length - 1;
    for(_tmpTokenId = _tokenId ; _tmpTokenId > 0 ; _tmpTokenId /= 10) {
      _result[lastIndex--] = byte(48 + _tmpTokenId % 10);
    }

    return string(_result);
  }
}

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00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000d4372797074616e7420437261620000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000024343000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _name (string): Cryptant Crab
Arg [1] : _symbol (string): CC

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000d
Arg [3] : 4372797074616e74204372616200000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [5] : 4343000000000000000000000000000000000000000000000000000000000000

bzzr://917211784d735b8f5264b3e1acdec385367f2276bcb4905e717f8c8268cd85e6