Compilare: user.c: In function ‘InsertBeforeNode’: user.c:13:2: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] newNode = (NODE*)malloc(sizeof(NODE)); ^ user.c:13:19: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] newNode = (NODE*)malloc(sizeof(NODE)); ^ user.c: In function ‘InsertAfterLast’: user.c:30:19: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] newNode = (NODE*)malloc(sizeof(NODE)); ^ user.c: In function ‘RemoveFromLast’: user.c:46:2: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration] free(aux); ^ user.c:46:2: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default] user.c: In function ‘UseNode’: user.c:76:12: warning: assignment makes pointer from integer without a cast [enabled by default] aux->used = 1; ^ user.c: In function ‘main’: user.c:147:22: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] location = (int *)malloc(sizeof(int)); ^ user.c:156:25: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] NODE* node = (NODE *)malloc(sizeof(NODE)); ^