writeStringstring
The term "writeStringstring" appears to be a typographical error or a misunderstanding of a programming concept. In most programming languages, there is no built-in function or keyword specifically named "writeStringstring". It is highly probable that this is a misspelling of a command related to writing strings to a file or output stream.
Commonly, functions for writing strings involve a name that includes "write" and "string". Examples might include
If "writeStringstring" was intended to represent a specific process, it might be a combination of writing one