> What have I done wrong?

**WRONG**
```solidity 
_balances[msg.sender] = _balances[msg.sender].sub(tokensToTransfer);
```

**CORRECT**
```
_balances[msg.sender] = _balances[msg.sender].sub(value);
```

> Why has nothing been sent to the contract?

I didn't see any code to add balance for contract