how to resolve file name issue with multiple inerfaces names , created in a file

how to :

when i create multiple interface(s) to check details, I have learn that of multiple extension of interface with interfaces.

it gives me error with file name , because previous I was named the file with interface name ,primarily developed but when i make new interface(s) ,editor frequently told me to rename the file name with currently developed interface .
what is the conflict & how to resolve .

Source: oop

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