Problem making a function to remove white space and punctuation from a character array

[kaned1]

Hello,

I'm trying to create a function that takes in an array of characters with a string, for example ENCRYPT THIS MESSAGE. I have read a few other topics on this site about people doing the same thing but none of the answers worked for me. So I tried to implement a function that takes in the character array and returns a new character array without spaces or punctuation. Here is the function I have so far:

  void RemovePunct(char old_String[], char new_String[]){
        for (int i = 0; i != 50; i++)
        {
		if(isspace(old_String[i])==true) continue;
		if(ispunct(old_String[i])==true) continue;
                if(isalnum(old_String[i])) new_String[i] = old_String[i]; 
        }
        return;
}

When I run the example string through this function it returns "ENCRYPTSTHIS▒MESSAGEE", "ENCRYPTTHIS▒MESSAGE", "ENCRYPTTHIS▒MESSAGEE", or some similar variation with extra letters or special characters. Sometimes it removes one space successfully but the other space is always a letter or some weird character. Anyone have any ideas what is wrong with this function or how to make it work successfully? Thanks in advanced for any help.

[Duthomhas]

The trick is to remember that you need two indices: one for the old string and one for the new string.

Every time you look at a character in the old string you'll add one to it's index.

But only when you copy a value to the new string do you want to add one to the new string's index.

That is, the indices will not necessarily be the same!

Hope this helps.