The CollapseSpacesAndPreserveLines method is a static extension method provided by the SandboxSystemExtensions class. It processes a given string by collapsing consecutive whitespace characters into a single space while preserving line breaks. This is useful for normalizing text input where you want to maintain the structure of paragraphs but reduce unnecessary spaces.

To use the CollapseSpacesAndPreserveLines method, simply call it on any string instance. This method is an extension method, so it can be called as if it were a method on the string class.

Example usage:

string input = "This   is   a   test.\n\nThis   is   another   line.";
string result = input.CollapseSpacesAndPreserveLines();
// result: "This is a test.\n\nThis is another line."