Memory not freed:
-----------------
   Address     Size     Caller
0x0a02f398      0x1  at AndreaSterbini/modulo2.c:375
0x0a02f3a8      0x1  at AndreaSterbini/modulo2.c:375
0x0a02f3b8      0xb  at AndreaSterbini/modulo2.c:375