turn a char array into double c

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1double toDouble(const char* s, int start, int stop) {
2    unsigned long long int m = 1;
3    double ret = 0;
4    for (int i = stop; i >= start; i--) {
5        ret += (s[i] - '0') * m;
6        m *= 10;
7    }
8    return ret;
9}

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