NSString* replace_substring(NSString* source, NSRange range, NSString* replacementString, int PaddingLength)
{
    NSLog(@"Before padding: %@", source);
    auto SourceLength = [source length];
    auto BeginIndex = range.location;
    auto EndIndex = range.location + range.length;
    cout << "Begin index: " << BeginIndex << " , End index: " << EndIndex << " Source length: " << SourceLength;
    auto PreReplacementLength = EndIndex - BeginIndex;
    auto ReplacementLength = [replacementString length];
    auto PostReplacementLength = SourceLength + PaddingLength;
    auto target = [[[NSString alloc] init] autorelease];
    auto NextIndex = 0;
    for(auto i = 0; i < BeginIndex; ++i)
    {
        auto range = [source rangeOfComposedCharacterSequenceAtIndex:NextIndex];
        NextIndex += range.length;
        auto appendPart = [source substringWithRange:range];
        target = [target stringByAppendingString:appendPart];
    }
    for(auto i = 0; i < PreReplacementLength; ++i)
    {
        auto range = [source rangeOfComposedCharacterSequenceAtIndex:NextIndex];
        NextIndex += range.length;
    }
    target = [target stringByAppendingString:replacementString];
    int RemainingCharacters = ext::int64(SourceLength) - ext::int64(EndIndex) - 1;
    cout << " Rem char: " << RemainingCharacters << endl;
    for(auto i = 0; i < RemainingCharacters; ++i)
    {
        auto range = [source rangeOfComposedCharacterSequenceAtIndex:NextIndex];
        NextIndex += range.length;
        auto appendPart = [source substringWithRange:range];
        target = [target stringByAppendingString:appendPart];
    }
    return target;
}