/in/lab5.c: In function 'push1':
/in/lab5.c:20:16: warning: 'return' with a value, in function returning void
         return '\0';
                ^~~~
/in/lab5.c:18:6: note: declared here
 void push1(load_stack *s1, char input1){
      ^~~~~
/in/lab5.c: In function 'push2':
/in/lab5.c:29:16: warning: 'return' with a value, in function returning void
         return '\0';
                ^~~~
/in/lab5.c:27:6: note: declared here
 void push2(result *s2, char input2){
      ^~~~~