Function for sudoku

I wish to solve a skyscrapers which is a type of sudoku. Currently I print a 4 x 4 grid and populate it with zeros although I do not know how to write a function that correctly fills in all of the numbers based on the constraints and rules of the puzzle.

Code:

---

int        solve_sudoku(int tab[4][4], int value)
{

}
        //populate(tab, 4);
        //solve_sudoku(tab, 4);
        //print_tab(tab, 4);

---

Starting from a valid position and knowing the game rules would be a start.
Skyscraper Sudoku Rules Explained + 5 Tips & Techniques – Mastering Sudoku