_transferFrom(address,address,uint256) :
This function is an internal override of the transferFrom function in the ERC20 standard. It allows for the transfer of tokens from one address to another. It checks to see if the address from which the tokens are being transferred is the same as the address of the contract, and if so, it calls the transfer function of the token contract. Otherwise, it calls the transferFrom function of the token contract. (autogenerated documentation)
_beforeTransferTo(address,uint256) :
This function is an internal override of the _beforeTransferTo() function in the ERC20Proxy contract. It is used to approve the transfer of a certain amount of tokens from the contract to a specified address. It does this by calling the approve() function of the IERC20 token contract, passing in the address of the recipient and the amount of tokens to be transferred. (autogenerated documentation)