C++ TypingTutor

#include<stdio.h> 
#include<conio.h> 
#include<time.h> 
#include<windows.h> 
#include<stdlib.h> 
#include<time.h> 
struct node 
{ 
char data; 
node *next; 
}
*first,*l,*temp; 
void newNode(char data) 
{ 
if(first==NULL) 
{ 
first=new node(); 
first->data=data; 
first->next=NULL; 
l=first; 
} 
else 
{ 
while(l->next!=NULL) 
l=l->next; 
temp=new node(); 
temp->data=data; 
temp->next=NULL; 
l->next=temp; 
l=temp; 
} 
} 
void printAllNodes() 
{ 
l=first; 
while(l->next!=NULL) 
{ 
printf("%c ",l->data); 
l=l->next; 
} 
} 
time_t now11, later11; 
void sleep(int delay) 
{ 
now11=time(NULL); 
later11=now11+delay; 
while(now11<=later11)now11=time(NULL); 
} 
void gotoxy(short x, short y)
 { 
COORD pos = {x, y}; 
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos); 
} 
int RandomAlphabets() 
{ 
int number=rand()%2+1; 
switch(number) 
{ 
case 1: 
number=rand()% 26+65 ; 
return number; 
break; 
case 2: 
number=rand()%26+97; 
return number; 
break; 
} 
} 
int main()
{ 
srand(time(NULL) ); 
char character[19]; 
int Aplhabets=0; 
int x[19],y[19]; 
int gameCounter=0; 
int number; 
int i; 
int misses=0; 
do{ 
system("cls"); 
y[gameCounter]=0; 
x[gameCounter]=rand()%79; 
number =RandomAlphabets() ; 
character[gameCounter]=number; 
for(i=0;i<strlen(character)-1;i++)
{ 
gotoxy(x[i],y[i]); 
printf("%c",character[i]); 
y[i]=y[i]+1; 
} 
if(kbhit()) 
{ 
char ch=getch(); 
for(i=0;i<strlen(character)-1;i++) 
{ 
if(ch==character[i])
{ 
character[i]=' '; 
Aplhabets++; 
} 
} 
} 
gotoxy(1,22); 
printf("misses: %d/20",misses); 
if(misses>0)
{ 
gotoxy(1,23); 
printAllNodes(); 
} 
for(int i=0;i<19;i++) 
{ 
if(character[i]!=' '&&y[i]==18) 
{ 
misses++; 
newNode(character[i]); 
} 
} 
sleep(0); 
gameCounter++; 
if(gameCounter==19) 
{ 
gameCounter=0; 
} 
}
while(misses<20); 
system("cls"); 
printf("Number of Collected Alphabetss: %d",Aplhabets); 
printf("\nNumber of missed Alphabets:%d",misses); 
printf("\nScore: %d\n",Aplhabets*30); 
system("pause"); 
}