Split a long string in paragraph breaking on spaces

SplitTextIntoParagraphs.cs

        /// <summary>
        /// Splits a long text into paragraph with a limit on the characters
        /// </summary>
        /// <param name="text"></param>
        /// <param name="maxCharPerParagraph"></param>
        /// <returns></returns>
        public static List<string> SplitTextIntoParagraphs(string text, int maxCharPerParagraph)
        {
            List<string> paragraphs = new List<string>();
            int offset = 0;
            while(offset < text.Length) 
            {
                //first let's try an hard cut
                var textSlice = text[offset..Math.Min(offset+maxCharPerParagraph, text.Length)];
                var tail_len = text.Length - textSlice.Length - offset;

                if (tail_len > 0 && textSlice[textSlice.Length - 2] != ' ' && text[offset+ textSlice.Length] != ' ')
                {   // there is something left, and the cut seems to be in the middle of a sentence
                    var lastSpaceIndex = textSlice.LastIndexOf(' ');
                    if (lastSpaceIndex > 0)
                    {
                        textSlice = text[offset..(offset + lastSpaceIndex)];
                    }
                }
                offset += textSlice.Length;
                paragraphs.Add(textSlice);
            }
            return paragraphs;
        }