Выделение подстроки

#include <stdio.h>
#include <Windows.h>
#include <string.h>
 
#define FALSE 0
#define TRUE 1
#define MaxString 1000
#define MaxLength 1000
 
 
int main(void)
{ char buffer[MaxLength], substring[MaxLength];
  char *bf=NULL, *ss=NULL;
  int i=FALSE;
  int GetLine(char *bf,char *ss);
 
    bf=buffer;
    ss=substring;
 
    while (i<MaxString){GetLine(bf,ss); i++;}
 
return FALSE;
Sleep(100000);
}
 
int GetLine(char *bf,char *ss)
{char c;
 int i,length;
 void GetSubstring(char *bf, int length,char *ss);
 
for(i=0;(i<MaxLength)&&((c=getchar())!=EOF)&& (c!='\n');i++)
    *(bf+i)=c;
*(bf+i)='\0';
 
length=i;
printf("BUFFER %s\n",bf);
GetSubstring(bf,length,ss);
 
return FALSE;
}
 
void GetSubstring(char *bf, int length,char *ss)
{int i,IsSubString=FALSE;
 int counter=0;
 
for(i=0;i<length;i++)
    {
    if (*(bf+i)>='A' && *(bf+i)<='Z' )||( *(bf+i)>='a' && *(bf+i)<='z'))
        {*ss=*(bf+i);
        ss++;
        IsSubString=TRUE;
        counter++;
        printf(" There are substrings %d %d \n", counter,length);} 
 
    else printf("No substrings %d %d\n", counter,length);}
 
    
    if (IsSubString==TRUE)
    { *ss='\0' ;
    ss=ss-counter;printf("%c\n",*ss);
    printf("substring %s\n",ss);}
}