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sqrt?
A prime base > 16 will fox this, surely?
Furthermore: below, not up to and including.
There seem to be a lot of string copies in this. Why not just do the allocation and copy once, when you've found the largest-scoring word?
Almost identical to mine. As well as the OB1 problem (the final string might be of 27 bytes including the null terminator), there's a second issue: overflow in
letters.won't suffer from this.