Functions

1. import std.stdio;
   
   void printMenu(string[] items, int firstNumber) {
       foreach (i, item; items) {
           writeln(' ', i + firstNumber, ' ', item);
       }
   }
   
   void main() {
       string[] items =
           [ "Black", "Red", "Green", "Blue", "White" ];
       printMenu(items, 1);
   }
   

2. Here are some ideas:
   • Write a function named drawHorizontalLine() to draw horizontal lines.
   • Write a function named drawSquare() to draw squares. This function could take advantage of drawVerticalLine() and drawHorizontalLine() when drawing the square.
   • Improve the functions to also take the character that is used when "drawing". This would allow drawing each shape with a different character:

     void putDot(Canvas canvas, int line, int column, dchar dot) {
         canvas[line][column] = dot;
     }