scaled FFT result down by DATA_L (normalisation)

C/FFT_FP_realisation.c

@@ -80,8 +80,8 @@ void FFT_fp(int64_t* inp, uint32_t inp_L, int64_t* buf){
         m <<= 1;
     }
 	    for (uint32_t ii = 0; ii < inp_L; ++ii){
-	    	//buf[ii*2] /= inp_L;
-	    	//buf[ii*2+1] /= inp_L;
+	    	buf[ii*2] /= inp_L;
+	    	buf[ii*2+1] /= inp_L;
 	    	printf("re,im: %lld, %lld\n", (long long)buf[ii*2], (long long)buf[ii*2 +1]);
 	    }