Add log and log's unittest.

src/Function.cpp

@@ -144,7 +144,7 @@ namespace Aurora {
         return result;
     }
 
-    double *malloc(int size, bool complex) {
+    double *malloc(size_t size, bool complex) {
         if (!complex) return (double *) mkl_malloc(size * sizeof(double), 64);
         return (double *) mkl_malloc(size * sizeof(std::complex<double>), 64);
     }