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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
// Find facet for function that is called and execute the
// function if a facet is found and return any value.
fallback() external payable {
// get facet from function selector
address facet = selectorTofacet[msg.sig];
require(facet != address(0));
// Execute external function from facet using delegatecall and return any value.
assembly {
// copy function selector and any arguments
calldatacopy(0, 0, calldatasize())
// execute function call using the facet
let result := delegatecall(gas(), facet, 0, calldatasize(), 0, 0)
// get any return value
returndatacopy(0, 0, returndatasize())
// return any return value or error back to the caller
switch result
case 0 {revert(0, returndatasize())}
default {return (0, returndatasize())}
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