C İle Basit bir Web Browser

#include <stdio.h> 
  #include <conio.h> 
  #include <stdlib.h> 
  #include <graphics.h> 
  #include <dos.h> 
  #include <string.h> 
    
  void initialize_graphics_mode(); 
  int get_key(); 
  void draw(); 
    
  union REGS i, o; 
    
  main() 
  { 
    int key, i = 0, xpos, ypos, button; 
    char arr[200], temp[5], *ptr; 
    char a[] = "C:\\Progra~1\\Mozill~1\\firefox "; 
    
    strcpy(arr,a); 
    
    i = strlen(a); 
    
    initialize_graphics_mode(); 
    
    draw(); 
    
    while(1) 
    { 
      if(kbhit()) 
        key = get_key(); 
    
      if((key>=97&&key<=122)||(key>=65&&key<=90)||key==46||key==47||key==63) 
      { 
        arr[i] = key; 
        sprintf(temp,"%c",arr[i]); 
        outtext(temp); 
        if(getx()>470) 
        { 
          clearviewport(); 
          moveto(5,2); 
        } 
        i++; 
      } 
      else if ( key == 13 ) 
      { 
        arr[i] = '\0'; 
        system(arr); 
        break; 
      } 
      else if ( key == 27 ) 
      { 
        closegraph(); 
        exit(EXIT_SUCCESS); 
      } 
      if(button==1&&xpos>=150&&xpos<=480&&ypos>=300&&ypos<=330) 
      { 
        system("C:\\Progra~1\\Mozill~1\\firefox programmingsimplified.com"); 
        break; 
      } 
      key = -1; 
    } 
    
    closegraph(); 
    return 0; 
  } 
    
  void initialize_graphics_mode() 
  { 
    int gd = DETECT, gm, errorcode; 
    
    initgraph(&gd,&gm,"C:\\TC\\BGI"); 
    errorcode = graphresult(); 
    
    if( errorcode != grOk ) 
    { 
      printf("Graphics error : %s\n",grapherrormsg(errorcode)); 
    
      printf("Press any key to exit...\n"); 
      getch(); 
      exit(EXIT_FAILURE); 
    } 
  } 
    
  int get_key() 
  { 
    i.h.ah = 0; 
    int86(22,&i,&o); 
    
    return( o.h.al ); 
  } 
    
  void draw() 
  { 
    settextstyle(SANS_SERIF_FONT,HORIZ_DIR,2); 
    outtextxy(275,11,"Web Browser"); 
    outtextxy(155,451,"<a data-test="test" rel="nofollow" style="word-wrap: break-word; text-decoration: underline;" target="_blank" onclick="return dhExternalLinkRedirect(this)" href="/ExternalLinkRedirect?module=pgdcode&messageId=96026610&url=http://www.programmingsimplified.com"" data-href="http://www.programmingsimplified.com"">www.programmingsimplified.com"</a>); 
    outtextxy(5,105,"Enter URL : "); 
    rectangle(120,100,600,130); 
    setviewport(121,101,599,129,1); 
    moveto(5,1);