No, this is not grammatically correct. Curtis is the right way to say that something belongs to Curtis, because Curtis is the only one. If the noun is plural, you would use the back apostrophe to indicate possessive.
Edit: Sean, in my most humble opinion, as a person with experience as a writer and editor of English, as well as a programmer, I donβt feel that there is a simple answer to this problem. I donβt feel it is correct to write Curtis to express possessive, and I also feel that there is a widespread, though not universal, agreement on this issue.
The real work of any algorithmic approach to solving this problem is to determine whether the noun is exceptional or plural, and this is an extremely difficult task to solve, which goes beyond the answer of StackOverflow. Good luck to you.
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