how finish this function ? we have the following fact :

The parameter refers to a string that describes one of the four directions: down, across, down-right, or down-left.

Assume that the str value is one of: DOWN, ACROSS, DOWN_RIGHT, or DWON_LEFT.

The game board size is given by the constants N_ROWS and N_COLUMNS.

This function returns the difference between the string indices of two adjacent squares on a line that goes in the direction specified by the first parameter. and the next one : The objective of the game is to be the first player to connect NUM_MATCH squares in a row either horizontally (or simply "across"), vertically (or simply "down"), or diagonally. Diagonal lines come in two orientations: downward to the right and downward to the left. Assuming NUM_MATCH is 3, here are some examples of where squares should be placed in order to win the game:

def calculate_increment(direction:str)-> int : 

Across Down Left Down Right Down Across Down Left Down Right Down