Proxy with Inheritance

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Task 5
Implement a basic Proxy contract which has the following code in its fallback function
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assembly {
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    let ptr := mload(0x40)
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    calldatacopy(ptr, 0, calldatasize)
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    let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
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    let size := returndatasize
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    returndatacopy(ptr, 0, size)
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​
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    switch result
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    case 0 { revert(ptr, size) }
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    default { return(ptr, size) }
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 }
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 *https://blog.zeppelinos.org/proxy-patterns/
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Add functions to Proxy for setting the delegated address and getting the delegated address
Implement the Score contract as before and use the Proxy contract with remix 
Implement ScoreV2 and change the proxy address to point to that
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Safe approach
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