stringToBeEncoded = 'sample string aaaa eeee sample sample'
test = HuffmanCoder(stringToBeEncoded)
print()
test.printEncodedString()
print()
test.printFrequencyCountOfInput()
print()
test.printMappingTableAsciiToHuffman()
print()
test.bitsUsedByBothMethods()
print()

Note: pass only a string to the constructor!!
1. 
# used to print the attributes in a formatted manner
printMappingTableAsciiToHuffman():
printFrequencyCountOfInput():
printEncodedString():
bitsUsedByBothMethods():

2.
# encodes the String passed by the user and returns it,
# does NOT store it, except the encoded string passed in the constructor 
encode(ipString :str):

3.
# user can provide a string consisting of 0 and 1 and get it decoded to ASCII
decode(ipString : str):

4.
# get the dictionary which has the mapping from ASCII character to its encoded bit string
getMappedTableAsciiToHuffman():

5.
# get the dictionary which has the mapping from ASCII character to its number of occurences
getFrequencyCountOfInput():

6.
# returns the orignal string passed as an input
getInputString():

7.
# returns the orignal string encoded to huffman
getEncodedString():

   Copyright 2021 Shikhar Sahu

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.