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https://docs.soliditylang.org/en/v0.8.12/types.html

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Error encoding arguments: SyntaxError: Unexpected token e in JSON at position 2 while string...

Below is my contract code: pragma solidity ^0.5.1; library Strings { function concat(string memory _base, string memory _value) internal returns (string memory) { bytes memory _baseBytes … (_newValue); } } contract TestStrings { using Strings for string; function testCOntract(string memory _base) public returns(string memory) { return _base.concat("_suffix"); } …