Remove extra white spaces in C++

Question

I tried to write a script that removes extra white spaces but I didn\'t manage to finish it.

Basically I want to transform abc sssd g g sdg gg gf into

Answer 1

There are already plenty of nice solutions. I propose you an alternative based on a dedicated meant to avoid consecutive duplicates: unique_copy():

void remove_extra_whitespaces(const string &input, string &output)
{
    output.clear();  // unless you want to add at the end of existing sring...
    unique_copy (input.begin(), input.end(), back_insert_iterator(output),
                                     [](char a,char b){ return isspace(a) && isspace(b);});  
    cout << output<

Here is a live demo. Note that I changed from c style strings to the safer and more powerful C++ strings.

Edit: if keeping c-style strings is required in your code, you could use almost the same code but with pointers instead of iterators. That's the magic of C++. Here is another live demo.