# include
# include
void fun(char* a,char* b)
{
int i,j,k=0;
for(i=strlen(a)-1;i>=0;i--)
{
if(a[i]==' ')
{
for(j=i+1;a[j]&&a[j]!=' ';j++)
{
b[k++] = a[j];
}
b[k++] = ' ';
}
}
for(i=0;a[i]!=' ';i++)
b[k++] = a[i];
b[k] = '\0';
}
int main(void)
{
char a[20]="i am a stdudent",b[20];
fun(a,b);
printf("%s",b);
}