Updated the indentation and added the optimized var function

Source/StatisticsFunctions/arm_var_f64.c

@@ -49,6 +49,7 @@ void arm_var_f64(
 	uint32_t blockSize,
 	float64_t * pResult)
 {
+	
 	uint32_t blkCnt;                               /* Loop counter */
 	float64_t sum = 0.;                          /* Temporary result storage */
 	float64_t fSum = 0.;
@@ -60,28 +61,29 @@ void arm_var_f64(
 		*pResult = 0;
 		return;
 	}
-
+	arm_mean_f64(pInput, blockSize, &fMean);
-  /* Initialize blkCnt with number of samples */
+#if defined(ARM_MATH_NEON)
-  blkCnt = blockSize;
+	float64x2_t fValueV ,fsumV , pInputV , fMeanV;
+	fsumV = vdupq_n_f64(0.0f);
+	fMeanV = vdupq_n_f64(fMean);
+	blkCnt = blockSize >> 1U;
 	
 	while(blkCnt > 0U)
 	{
-    /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
+		pInputV = vld1q_f64(pInput);
-
+		fValueV = vsubq_f64(pInputV, fMeanV);
-    sum += *pInput++;
+		fsumV = vmlaq_f64(fsumV, fValueV, fValueV);
-
+		pInput += 2 ;
-    /* Decrement loop counter */
 		blkCnt--;
 	}
+	fSum = vaddvq_f64(fsumV);
 	
-  /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize  */
+	blkCnt = blockSize & 1 ;
-  fMean = sum / (float64_t) blockSize;
-
-  pInput = pSrc;
 	
+#else
 	/* Initialize blkCnt with number of samples */
 	blkCnt = blockSize;
-
+#endif
 	while (blkCnt > 0U)
 	{
 		fValue = *pInput++ - fMean;