As a "quick fix," avoiding the need to modify every one of your hundred(!) individual character functions, you could try something like:

unsigned char print_character( unsigned char code_to_print )
{
   switch( code_to_print )
   {
      case code_A: A();
                   return WIDTH_OF_A;

      case code_B: B();
                   return WIDTH_OF_B;

      case code_C: C();
                   return WIDTH_OF_C;

      case code_D: D();
                   return WIDTH_OF_D;

      etc, etc,...

      default:     /* invalid code - print nothing */
                   return 0;

   } // switch
} // print_character

even with this, it should be immediately obvious why having an individual function for each character is a Bad Idea!

Note:
The above is somewhat unstructured, in having multiple returns in the switch.
Purists would do it like this:

unsigned char print_character( unsigned char code_to_print )
{
   unsigned char width_just_printed;

   switch( code_to_print )
   {
      case code_A: A();
                   width_just_printed = WIDTH_OF_A;
                   break;

      case code_B: B();
                   width_just_printed = WIDTH_OF_B;
                   break;

      case code_C: C();
                   width_just_printed = WIDTH_OF_C;
                   break;

      case code_D: D();
                   width_just_printed = WIDTH_OF_D;
                   break;

      etc, etc,...

      default:     /* invalid code - print nothing */
                   width_just_printed = 0;
                   break;
   } // switch

   return width_just_printed;

} // print_character