Memory not freed:
-----------------
   Address     Size     Caller
0x09577388      0x1  at AndreaSterbini/modulo2.c:375
0x09577398      0x3  at AndreaSterbini/modulo2.c:375
0x095773a8      0x2  at AndreaSterbini/modulo2.c:375
0x095773b8     0x13  at AndreaSterbini/modulo2.c:375