Memory not freed:
-----------------
   Address     Size     Caller
0x09f0b3d8      0xa  at ../../../AndreaSterbini/modulo4.c:60
0x09f0b738      0x6  at 0x1c39f0
0x09f0c2e8    0xfac  at ../../../AndreaSterbini/modulo3.c:17