char *fun() 
{ 
  char* s = (char*)calloc(100, sizeof(char*) ); 
  if (s) 
    strcpy ( s , "abc " ); 
  return s; 
} 

char* fun(char*s) 
{ 
  if (s) 
    strcpy(s, "abc "); 
  return s; 
} 

char* fun(char*s, int len) 
{ 
  if (s) 
  { 
    strncpy(s, "abc ", len-1); 
    s[len-1] = 0; 
  } 
  return s; 
} 

char* fun() 
{ 
  static char s[100]; 
  strcpy(s, "abc "); 
  return s; 
} 

const char* fun() 
{ 
  static char s[100]; 
  strcpy(s, "abc "); 
  return s; 
} 

char g_s[100]; 
char* fun() 
{ 
  strcpy(g_s, "abc "); 
  return s; 
}