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#include<string.h>
#include<stdlib.h>
 
char **allsubstring(char *);
 
// The function will return array of the substring
 
char** allsubstring(char *input)
{
 
int index1,index2,index3,noofsubstring,index4,index5;
char ** strarray;
char *buffer;
if(input == NULL) { printf("there is no string\n"); return NULL;}
 
noofsubstring=(strlen(input)*(strlen(input)+1))/2;
 
buffer = (char *)malloc(sizeof(char)*strlen(input));
strarray = (char **) malloc(sizeof(char *)*noofsubstring);
 
index5=-1;
for(index1=strlen(input)-1;index1>=0;--index1)
{
 for(index2=0;index2<=index1;++index2)
 {
  index4=0;
  for(index3=index2;index3<=index1;++index3)
  {
   sprintf(buffer+index4,"%c",input[index3]);
   ++index4;
  }
   sprintf(buffer+index4,"%c",'\0');//printf("%s\n",buffer);
   strarray[++index5] = (char *)malloc(sizeof(char)*strlen(buffer));
   strcpy(strarray[index5],buffer);
 }
}
 free(buffer);
 return strarray;
}

prog.c:14:21: warning: implicitly declaring library function 'printf' with type 'int (const char *, ...)'
if(input == NULL) { printf("there is no string\n"); return NULL;}
                    ^
prog.c:14:21: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'
prog.c:29:4: warning: implicitly declaring library function 'sprintf' with type 'int (char *, const char *, ...)'
   sprintf(buffer+index4,"%c",input[index3]);
   ^
prog.c:29:4: note: include the header <stdio.h> or explicitly provide a declaration for 'sprintf'
2 warnings generated.
/usr/bin/../lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/crt1.o: In function `_start':
/build/glibc-5CYv_T/glibc-2.19/csu/../sysdeps/i386/start.S:111: undefined reference to `main'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Standard output is empty