#define slength strlen
int spos(char *c,  char *s);
char *scopy( char *s, int k, int n);
void sdelete(char *s, int k, int n);
char* sinsert(const char *c, char *s, int k);
char * strnorm(char *s);
int spos(char *c, char *s)
{
  char *ptr;
  ptr = strstr(s, c);
  return  ptr-s;
}
char *scopy( char *s, int k, int n)
{
  char *ptr=strdup(s);
  int i,j;
  for( i=0, j=k; i<n && s[i]!='\0' ; i++,j++)
    ptr[i]=s[j];
  ptr[i]='\0';
  return ptr;
}
void sdelete(char *s, int k, int n)
{
  for (int i=k,j=k+n; s[i]!='\0';i++,j++)
    s[i]=s[j];
}
char* sinsert(const char *sc, char *sd, int k)
{
  char *p=strdup(sd);
  strcat(p,sc);
  int i,j,lc=strlen(sc);
  for (i=0;i<k;i++)
    p[i]=sd[i];
  for (j=0;j<lc;j++,i++)
    p[i]=sc[j];
  for (j=k;sd[j]!='\0';i++,j++)
    p[i]=sd[j];
  p[i]='\0';
  return p;
}
char * strnorm(char *s)
{
  char *p=strdup(s);
  int pos=spos("  ",p);
  cout<<"pos="<<pos<<endl;
  while (pos>=0)
  {
    sdelete(p,pos,1);
    pos=spos("  ",p);
  cout<<"pos="<<pos<<endl;
  }
  if (p[0]==' ')
    sdelete(p,0,1);
  if (p[slength(p)-1]!=' ')
    strcat(p," ");
  cout<<"p= |"<<p<<"|"<<endl;
  return p;
} // end of strnorm