Compilare: main.c: In function 'getMatches': main.c:42:19: warning: implicit declaration of function 'realloc' [-Wimplicit-function-declaration] 42 | pos = realloc(pos, sizeof(pos) + 4); | ^~~~~~~ main.c:42:19: warning: incompatible implicit declaration of built-in function 'realloc' main.c:3:1: note: include '<stdlib.h>' or provide a declaration of 'realloc' 2 | #include <time.h> +++ |+#include <stdlib.h> 3 | main.c: In function 'main': main.c:80:15: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration] 80 | pattern = malloc(sizeof(char)*(patternLen+1)); | ^~~~~~ main.c:80:15: warning: incompatible implicit declaration of built-in function 'malloc' main.c:80:15: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:81:11: warning: implicit declaration of function 'calloc' [-Wimplicit-function-declaration] 81 | lps = calloc(patternLen, sizeof(int)); | ^~~~~~ main.c:81:11: warning: incompatible implicit declaration of built-in function 'calloc' main.c:81:11: note: include '<stdlib.h>' or provide a declaration of 'calloc' main.c:98:12: warning: unused variable 'time_spent' [-Wunused-variable] 98 | double time_spent = (double)(end - begin) / CLOCKS_PER_SEC; | ^~~~~~~~~~