HashString is used for computing a string's hash code.It supports many hash methods(base64,md5,sha-1,sha-224,sha3-224,sha-256,sha3-256,sha-384,sha3-384,sha-512,sha3-512).
QRCodeString generates qr code from a string.It produces a random string of specified length and then encodes it into a qr code.The generated qr code image can be saved as a jpg file.
