Here is a StackOverflow Q&A about something just like this: https://stackoverflow.com/questions/38923376/return-a-new-string-that-sorts-between-two-given-string

Here is a StackOverflow Q&A about something just like this: https://stackoverflow.com/questions/38923376/return-a-new-string-that-sorts-between-two-given-strings https://stackoverflow.com/questions/38923376/return-a-new-st... A similar system is used in Jira called LexoRank