Is it safe to have the Crowdsale and Token contract combined as one contract instead of two separate ones? Are there any drawbacks/advantages of doing this?
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Yes, you can do this.
To me, the drawback is that it makes it harder for someone to read your contract and understand it. The crowdsale lasts only a short time, while the token will (hopefully) be used for much longer. It's nice if the token contract is just a token contract. Keeping that code short and simple will make it easier for others to verify that it does what it's supposed to.
