CareerCup

char * setEmpty(int len){
	if (0>len) return NULL;
	char * c = (char *) malloc(len+1);
	memset(c, 0, len+1);
	return c;
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include<stdlib.h>
#include <math.h>
#include <string.h>


char * create(int len)
{
   char my_str[100]={' ', ' ', ' '};

   char *str= (char *)malloc(len+1);

   // just copy based on the length drop everything else
   strncpy(str,my_str,len+1);

   return str;
}


int main()
{

  char *str2 = create(2);
  printf("%s\n", str2);

  getchar();
  return 0;


}

or may be you can use calloc to assign memory it will initializes the string to 0 by default.

char * setEmpty(int len){
if (0>len) return NULL;
char * c = (char *) calloc(len+1);

return c;
}

calloc takes in 2 parameters: number of elements, size of each element. Therefore it should be:

calloc(1, len+1);