interface IRegistry {
    /**
    * @dev This event will be emitted every time a new proxy is created
    * @param proxy representing the address of the proxy created
    */
    event ProxyCreated(address proxy);

    /**
    * @dev This event will be emitted every time a new implementation is registered
    * @param version representing the version name of the registered implementation
    * @param implementation representing the address of the registered implementation
    */
    event VersionAdded(string version, address implementation);

    /**
    * @dev Registers a new version with its implementation address
    * @param version representing the version name of the new implementation to be registered
    * @param implementation representing the address of the new implementation to be registered
    */
    function addVersion(string version, address implementation) external;

    /**
    * @dev Tells the address of the implementation for a given version
    * @param version to query the implementation of
    * @return address of the implementation registered for the given version
    */
    function getVersion(string version) external view returns (address);
}
/**
 * @title IRegistry
 * @dev This contract represents the interface of a registry contract
 */
function getVersion(string version) external view returns (address);

/**
 * @dev Tells the address of the implementation for a given version
 * @param version to query the implementation of
 * @return address of the implementation registered for the given version
 */