String vs Switch Incompatible

I am writing code that uses both strings and switch functions, and I can’t get both to work at the same time. If I use #include , strings work and switch functions don’t, if I use #include <string.h>, strings don’t work and switches do. Am very confused, if anyone knows whats going on/how to fix it, please help

As with all things code, we can’t really do anything until you post your code (or a sample that shows your point)