How can write this function in c programming?

typedef struct { int x; int y; } Point_t;
typedef struct { Point_t left_up; int right down; } Rectangle_t;

I have this function:

double maxSumConstPoint(double table[][COL_COUNT], int nRow, int leftUpY, int leftUpX, int* rightDownY, int* rightDownX){
    int rDX;    /*x coordinate of the right down corner of the rec*/
    int rDY;    /*y coordinate of the right down corner of the rec*/
    double temp;
    /*initialize the rectangular with the one including only one point*/
    double sum=table[leftUpX][leftUpY];
    *rightDownY=leftUpY;
    *rightDownX=leftUpX;

/*Try all feasible rectangulars by changing the right down corner*/
for(rDY=leftUpY; rDY<nRow; ++rDY){
    for(rDX=leftUpX; rDX<COL_COUNT; ++rDX){
        temp=getSum(table, leftUpY, leftUpX, rDY, rDX);
        if(temp>sum){
             /*a better rectangular is found, perform an update */
            sum=temp;
            *rightDownY=rDY;
            *rightDownX=rDX;
        }
    }
 }

return sum;

}

I need to turn the following functions:

Rectangle_t maxSumConstPoint(double table[][COL_COUNT], int nRow, Point_t 
left_up)

How can write this function?