C++: How do I make this shape from this code?

I am trying to make this shape from the code below. I'm confused as to how to make it print the 2nd row, second to last star without it skipping and printing the extra space before printing the star. Once that is figured out would the bottom half, when the stars expands back out, would the code be similar to the top half? I have tried a couple combinations of code between c and r but I have been stuck with what I currently.

---------------------- //row 0
*                   *| //row 1
* *               * *| //row 2
* * *           * * *|
* * * *       * * * *|
* * * * *   * * * * *|
* * * * * * * * * * *|
* * * * *   * * * * *|
* * * *       * * * *|
* * *           * * *|
* *               * *|
*                   *|
----------------------

#include <iostream>

using std::cout; using std::cin; using std::endl;

int main() {
    cout << "Enter a positive odd number less than 40: ";
    int num = 0;
    int z = 1;

    for (int a = 0; a < 3; ++a)
    {   
        cin >> num;
            if (num < 38 && num > 0 && num % 2 == 1)
            {
                cout << "Thank you!" << endl << endl;

                for (int r = 0; r < num; ++r)  //outer loop/rows
                {
                    for (int c = 0; c < num; ++c)  //inner loop/columns
                    {
                        if (r == 0) cout << "--"; //top of square
                        else if (c >= r + r - c && c < num - 1)
                            cout << "  ";
                        //else if (c == num - 1) cout << "*|";
                        else if (r == num - 1) cout << "--"; //bottom of square
                        else if (c == num - 1) cout << "*|"; //right side of square
                        else if (r > c) cout << "* ";
                    }
                        cout << endl;

                }
                break;
            }
            else cout << "Please enter a positve odd number that is less than 40!" << endl;
    }
    cout << endl;
}