The Strings Collection of the AppleIIAsm Library is dedicated to macros used for handling strings and substrings. In particular, this refers to the default type of string: those with a preceding length-byte. If these macros need to be used on another type of string, such as a null-terminated string, then the `STRPC` macro should be used on the string first to convert it to a preceding length-byte type.
The strings collection can be divided further into two categories: those that deal with whole strings and those that deal with substrings exclusively. This is currently reflected in the fact that the macros are held in separate files and use different demos.
