fix:Import the IERC20 interface into the teaching contract in Chapter… #153
+7
−1
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solidity 103
在章节 43/44 中教程合约没有导入
IERC-20
接口会导致编译失败,以下是修复点:43 章节中教程合约增加
IERC-20
接口。44 章节中教程合约增加
IERC-20
接口和合约定义。