interface IToken { 

    /** 
     * Get the total supply of tokens
     * 
     * @return The total supply
     */
    function totalSupply() public view returns (uint);


    /** 
     * Get balance of `_owner` 
     * 
     * @param _owner The address from which the balance will be retrieved
     * @return The balance
     */
    function balanceOf(address _owner) public view returns (uint);


    /** 
     * Send `_value` token to `_to` from `msg.sender`
     * 
     * @param _to The address of the recipient
     * @param _value The amount of token to be transferred
     * @return Whether the transfer was successful or not
     */
    function transfer(address _to, uint _value) public returns (bool);


    /** 
     * Send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
     * 
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value The amount of token to be transferred
     * @return Whether the transfer was successful or not
     */
    function transferFrom(address _from, address _to, uint _value) public returns (bool);


    /** 
     * `msg.sender` approves `_spender` to spend `_value` tokens
     * 
     * @param _spender The address of the account able to transfer the tokens
     * @param _value The amount of tokens to be approved for transfer
     * @return Whether the approval was successful or not
     */
    function approve(address _spender, uint _value) public returns (bool);


    /** 
     * Get the amount of remaining tokens that `_spender` is allowed to spend from `_owner`
     * 
     * @param _owner The address of the account owning tokens
     * @param _spender The address of the account able to transfer the tokens
     * @return Amount of remaining tokens allowed to spent
     */
    function allowance(address _owner, address _spender) public view returns (uint);
}
/**
 * ERC20 compatible token interface
 *
 * - Implements ERC 20 Token standard
 * - Implements short address attack fix
 *
 * #created 29/09/2017
 * #author Frank Bonnet
 */
function approve(address _spender, uint _value) public returns (bool);

/** 
 * `msg.sender` approves `_spender` to spend `_value` tokens
 * 
 * @param _spender The address of the account able to transfer the tokens
 * @param _value The amount of tokens to be approved for transfer
 * @return Whether the approval was successful or not
 */