Consider the following C program: The identifier x is declared in the methods outer scope. Another declaration occurs within the nested scope that assigns y. In C, the nested declaration of x could be regarded as a declaration of some other name, provided that the inner scopes reference to is appropriately renamed x. Design a set of AST visitor methods that

Renames and moves nested variable declarations to the methods outermost scope

Appropriately renames symbol references to preserve the meaning of the program

int func int x, y; x 10 int x; x 20 return (x y)