Remove Recursive Keep Count

        public static string RemoveRecursiveChar(string input, char ch, int keepCount)
        {
            var len = input.Length;
            var chars = new char[len];
            var writeIndex = 0;
            var charCount = 0;
            for (var j = 0; j < len; j++)
            {
                if (input[j] != ch)
                {
                    chars[writeIndex++] = input[j];
                    charCount = 0;
                }
                else if (charCount + 1 <= keepCount)
                {
                    chars[writeIndex++] = ch;
                    charCount++;
                }
            }

            return new string(chars, 0, writeIndex);
        }