Compilare: user.c: In function ‘fill’: user.c:47: warning: implicit declaration of function ‘push’ user.c: At top level: user.c:63: warning: conflicting types for ‘push’ user.c:47: note: previous implicit declaration of ‘push’ was here user.c: In function ‘main’: user.c:106: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:112: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result