Write a function change_player_char(board, player, new_char) which changes the character that a player is using in a partially-complete game of noughts-and-crosses. The parameters are as follows:
board is a list of three rows, where each row is a list of three one-character strings, each being either ‘O’, ‘X’ or ‘.’, where ‘.’ represents an empty square. player is the character that a player is currently using in the game, for example, ‘O’ or ‘X’. new_char is the character that is to be used to replace player within the board. The function must modify the given board in place; it returns None.
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