foo.c: In function 'main':
foo.c:6:17: warning: implicit declaration of function 'One' [-Wimplicit-function-declaration]
    6 |         int t = One(a2, b2);
      |                 ^~~
foo.c:9:17: warning: implicit declaration of function 'Two' [-Wimplicit-function-declaration]
    9 |         int i = Two(c1, c2);
      |                 ^~~
foo.c: In function 'Two':
foo.c:42:13: warning: unused variable 'y' [-Wunused-variable]
   42 |         int y = b;
      |             ^
foo.c:41:13: warning: unused variable 'x' [-Wunused-variable]
   41 |         int x = a;
      |             ^

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