Compilare: user.c: In function ‘fill’: user.c:46: warning: implicit declaration of function ‘push’ user.c: At top level: user.c:53: warning: conflicting types for ‘push’ user.c:46: note: previous implicit declaration of ‘push’ was here user.c: In function ‘lee’: user.c:90: warning: ‘return’ with no value, in function returning non-void user.c:73: warning: unused variable ‘cont’ user.c: In function ‘main’: user.c:100: warning: unused variable ‘s’ user.c:96: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:103: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result