Compilare: main.c: In function 'invMod': main.c:21:5: warning: implicit declaration of function 'euclid' [-Wimplicit-function-declaration] 21 | euclid(a, m, &x, &y); | ^~~~~~ main.c: At top level: main.c:29:6: warning: conflicting types for 'euclid' 29 | void euclid(long long a, long long m, long long *x, long long *y) { | ^~~~~~ main.c:21:5: note: previous implicit declaration of 'euclid' was here 21 | euclid(a, m, &x, &y); | ^~~~~~