Unable to access a variable declared inside an if statement (Error: is shadowing variable)

[BoQsc via Digitalmars-d-learn]

I'm lacking knowledge on how to achieve what I want and getting 
an error.
What is the correct way to do what I tried to achieve in this 
code?
Everything was intuitive until I started to add notice variable 
to the writeln. Rdmd says  variable `notice` is shadowing 
variable.

rdmd output:
C:\Users\vaida\Desktop>rdmd searchDirectory.d
searchDirectory.d(21): Error: variable `notice` is shadowing 
variable `searchDirectory.main.notice`
Failed: ["C:\\D\\dmd2\\windows\\bin\\dmd.exe", "-v", "-o-", 
"searchDirectory.d", "-I."]

searchDirectory.d
import std.stdio : writeln;
import std.file;
void main(){

        auto drivesLetters = [
                "A:", "I:", "Q:", "Y:",
                "B:", "J:", "R:", "Z:",
                "C:", "K:", "S:",                 "D:", "L:", "T:",
                "E:", "M:", "U:",
                "F:", "N:", "V:",
                "G:", "O:", "W:",
                "H:", "P:", "X:",
        ];
        
        foreach (string driveLetter; drivesLetters) {
                string notice;
                if (driveLetter.exists){
                        auto directory = "/Backup";
                        if ((driveLetter ~ directory).exists){
                                auto notice = "Backup directory exists.";
                                
                        }
                        writeln(driveLetter, notice);
                }
                
        }

        
}