Format MemorySize to Readble Value (bytes to KB /MB/GB)

AIM: to Format the Memory Size  
Input:20109bytes
Output:20kb
Solution:
Step 1) Write a method to convert the sizes.
public String formatSize(long size) {
String suffix = null;

if (size >= 1024) {
suffix = "KiB";
size /= 1024;
if (size >= 1024) {
suffix = "MiB";
size /= 1024;
}
}
StringBuilder resultBuffer = new StringBuilder(Long.toString(size));

int commaOffset = resultBuffer.length() - 3;
while (commaOffset > 0) {
resultBuffer.insert(commaOffset, ',');
commaOffset -= 3;
}

if (suffix != null)
resultBuffer.append(suffix);
return resultBuffer.toString();
}
Step 2) Call this method as
String formattedMemory= formatSize(100000);
Result : 
formattedMemory will have in 10MB.