abstract contract ProjectProxy is Proxy {
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function implementation() public view returns (address) {
        return _implementation();
    }

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view override returns (address impl) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) internal {
        require(Address.isContract(newImplementation), "ProjectProxy: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
}
/**
 * @dev Abstract Project Proxy
 */
function _implementation() internal view override returns (address impl) {
    return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
}

/**
 * @dev Returns the current implementation address.
 */