contract TokenERC20 {

using SafeMath for uint256;
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
//
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);

/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function TokenERC20(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 for overflows
  // Subtract from the sender
  balanceOf[_from] = balanceOf[_from].sub(_value);
  // Add the same to the recipient
  balanceOf[_to] = balanceOf[_to].add(_value);
  emit Transfer(_from, _to, _value);
}

/**
* Function to 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);
}

/**
* function to Transfer tokens from other address
*
* Send `_value` tokens to `_to` in 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) {
  allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
  _transfer(_from, _to, _value);
  return true;
}

/**
* function Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in 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;
}


/**
*Function to 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) {
  balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);            // Subtract from the sender
  totalSupply = totalSupply.sub(_value);                      // Updates totalSupply
  emit Burn(msg.sender, _value);
  return true;
}



/**
* Destroy tokens from other ccount
*
* 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) {
  balanceOf[_from] = balanceOf[_from].sub(_value);                         // Subtract from the targeted balance
  allowance[_from][msg.sender] =allowance[_from][msg.sender].sub(_value);             // Subtract from the sender's allowance
  totalSupply = totalSupply.sub(_value);                              // Update totalSupply
  emit Burn(_from, _value);
  return true;
}


}
function approve(address _spender, uint256 _value) public returns (bool success) {
  allowance[msg.sender][_spender] = _value;
  return true;
}
/**
 * function Set allowance for other address
 *
 * Allows `_spender` to spend no more than `_value` tokens in your behalf
 *
 * @param _spender The address authorized to spend
 * @param _value the max amount they can spend
 */