0048-rotate-image.cs

public class Solution {
    public void Rotate(int[][] matrix) {
        (int left, int right) = (0, matrix.Length -1);
        
        while(left < right) {
            var limit = right - left;
            for(var i = 0; i < limit; i++) {
                (int top, int bottom) = (left, right);
                
                // save the top left position
                var topLeft = matrix[top][left + i];
                
                // put the bottom left value to the top left position
                matrix[top][left + i] = matrix[bottom - i][left];
                
                // put the bottom right value to the bottom left position
                matrix[bottom - i][left] = matrix[bottom][right - i];
                
                // put the top right value to the bottom right position
                matrix[bottom][right - i] = matrix[top + i][right];                 

                // put the saved top left value to the top right position
                matrix[top + i][right] = topLeft;
                    
                
            }
            
            left++;
            right--;
        }
        
        return;
    }
}