error: function returns address of local variable

I’m beginner with C and I am learning on my own. I am creating the following function:

char *foo(int x){
     if(x < 0){
        char a[1000];
        char b = "blah";
        x = x - 1;
        char *c = foo(x);
        strcpy(a, b);
        strcat(a, c);
        return a;
      }
    blah ...
}

I am basically trying to return an appended string, but I get the following error:

“error: function returns address of local variable”, any suggestions, how to fix this?

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