Fixing linting

Author: sirhill

common/contracts/token/TokenERC20.sol

@@ -11,7 +11,7 @@ import "../interface/IERC20.sol";
  * SPDX-License-Identifier: MIT
  *
  * Error messages
- *   TE01: Address is invalid
+ *   TE01: Recipient is invalid
  *   TE02: Not enougth tokens
  *   TE03: Approval too low
  */

common/contracts/token/TokenNFT.sol

@@ -18,8 +18,7 @@ import "../convert/Bytes32Convert.sol";
 contract TokenNFT is INFT {
   using Bytes32Convert for bytes32;
 
-  uint256 constant ALL_TOKENS = ~uint256(0);
-  uint256 constant NO_TOkENS = uint256(0);
+  uint256 constant internal ALL_TOKENS = ~uint256(0);
 
   string internal name_;
   string internal symbol_;