sps.c
double cellToDouble(Cell *cell) {
    char *end;
    double val = strtod(cell->str, &end);

    if (end == cell->str)
        return NAN;

    return val;
}
// gets cell pointer from its coordinates
gets cell pointer from its coordinates
gets cell pointer from its coordinates
double cellToDouble(Cell *cell) {
    char *end;
    double val = strtod(cell->str, &end);
    if (end == cell->str)
        return NAN;
    return val;
}
double cellToDouble ( Cell * cell ) { char * end ; double val = strtod ( cell -> str , & end ) ; if ( end == cell -> str ) return NAN ; return val ; }
gets cell pointer from its coordinates
gets cell pointer from its coordinates