insert_unichar
Description:
Converts a Unicode character into UTF-8, and insert it into the string at the given position.
Example: Insert unichar:
public static int main (string[] args) {
	// Output: ``hello, world!``
	StringBuilder builder = new StringBuilder ("hello world\n");
	builder.insert_unichar (5, ',');
	builder.insert_unichar (12, '!');
	print (builder.str);
	return 0;
}
    
    valac --pkg glib-2.0 GLib.StringBuilder.insert_unichar.vala
    Parameters:
| this | |
| pos | 
           the position at which to insert character, or -1 to append at the end of the string  | 
      
| wc | 
           a Unicode character  | 
      
Returns:
| 
           this  |