strcat()

A strcat() function.

Use case: building a pathname from directory components (walking dentry), I'd like to have a buf[PATH_MAX] and then keep adding directory strings and '/'s to it. Maybe there's just a better way to do this.

No file, test, or entry point is named. Start by clarifying how strcat() should support the buf[PATH_MAX] pathname-building use case while walking dentries, and whether an existing approach is preferred. Done should mean the API and expected behavior are agreed and the requested pathname construction is covered by appropriate tests.

Written by the indexing model from the issue text.