pragma solidity 0.4.23; 
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }
contract CANDY {
    // Public variables of the token
    string public name; 
    string public symbol; 
    uint8 public decimals = 18; // 18 decimals is the strongly suggested default, avoid changing it 
    uint256 public totalSupply; // This creates an array with all balances 
    mapping (address => uint256) public balanceOf; 
    mapping (address => mapping (address => uint256)) public allowance; // This generates a public event on the blockchain that will notify clients 
    event Transfer(address indexed from, address indexed to, uint256 value); // This notifies clients about the amount burnt 
    event Burn(address indexed from, uint256 value);
    /**
     * Constructor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */ 
     constructor (
         uint256 initialSupply, 
         string tokenName,
         string tokenSymbol )public { 
             totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount 
             balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens 
             name = tokenName; // Set the name for display purposes 
             symbol = tokenSymbol; // Set the symbol for display purposes
        }
     /**
     * Internal transfer, only can be called by this contract
     */
     function _transfer(address _from, address _to, uint _value) internal { 
         // Prevent transfer to 0x0 address. Use burn() instead 
         require(_to != 0x0); // Check if the sender has enough 
         require(balanceOf[_from] >= _value); // Check for overflows 
         require(balanceOf[_to] + _value >= balanceOf[_to]); // Save this for an assertion in the future 
         uint previousBalances = balanceOf[_from] + balanceOf[_to]; // Subtract from the sender 
         balanceOf[_from] -= _value; // Add the same to the recipient 
         balanceOf[_to] += _value;
         emit Transfer(_from, _to, _value); // Asserts are used to use static analysis to find bugs in your code. They should never fail 
         assert(balanceOf[_from] + balanceOf[_to] == previousBalances); } 
    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */ 
    function transfer(address _to, uint256 _value) public { 
       _transfer(msg.sender, _to, _value); 
    } 
    /**
     * Transfer tokens from other address
     *
     * Send `_value` tokens to `_to` on behalf of `_from`
     *
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value the amount to send
     */ 
     function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) 
     { 
        require(_value <= allowance[_from][msg.sender]); // Check allowance 
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value); return true;
     } 
     /**
     * Set allowance for other address
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     */
     function approve(address _spender, uint256 _value) public returns (bool success)
     { 
       allowance[msg.sender][_spender] = _value; return true;
     }
     /**
     * Set allowance for other address and notify
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf, and then ping the contract about it
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     * @param _extraData some extra information to send to the approved contract
     */ 
     function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) 
      {
      tokenRecipient spender = tokenRecipient(_spender); 
      if (approve(_spender, _value)) 
        { spender.receiveApproval(msg.sender, _value, this, _extraData); 
          return true;
        }
      } 
     /**
     * Destroy tokens
     *
     * Remove `_value` tokens from the system irreversibly
     *
     * @param _value the amount of money to burn
     */ 
     function burn(uint256 _value) public returns (bool success)   
     { 
         require(balanceOf[msg.sender] >= _value); // Check if the sender has enough  
         balanceOf[msg.sender] -= _value; // Subtract from the sender 
         totalSupply -= _value; // Updates totalSupply 
         emit Burn(msg.sender, _value); return true; 
         
     } 
     /**
     * Destroy tokens from other account
     *
     * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
     *
     * @param _from the address of the sender
     * @param _value the amount of money to burn
     */
     function burnFrom(address _from, uint256 _value) public returns (bool success) 
     { 
         require(balanceOf[_from] >= _value); // Check if the targeted balance is enough 
         require(_value <= allowance[_from][msg.sender]); // Check allowance 
         balanceOf[_from] -= _value; // Subtract from the targeted balance 
         allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance 
         totalSupply -= _value; // Update totalSupply 
         emit Burn(_from, _value); 
         return true; 
         
     } 
    
}