The function checks if there is a valid move in the specified direction in a matrix.
The direction parameter is a string that represents the direction in which to check. It can be one of the following values: 'up', 'right', 'down', or 'left'.
a boolean value.
The move
function updates the current position based on the given direction and updates the matrix accordingly.
The direction
parameter is a string that represents the direction in which to move.
It can have one of the following values: 'up', 'right', 'down', or 'left'.
The constructor initializes the Navigator object with the given parameters and sets the current position as visited in the matrix.