Added two optimized pythonic functions and removed unnecessary semicolons.

[rushil180101]

Hello, I have proposed the following changes to include optimized code and resemble pythonic syntax in the strings section.

1. Added function is_palindrome_pythonic() in strings/is_palindrome.py file. Used list comprehension to store alphanumeric characters in a list, then compared it with its reverse (using the pythonic way) and finally return the result of the comparison.

2. Added function add_binary_pythonic() in strings/add_binary.py file.

   • The string parameter a is concatenated with a prefix '0b'. This string (e.g. '0b1101') represents binary number 1101 in python.
     '0b' + a
   • Then the string is passed to int() function of python with second parameter as 2, which represents the base of the first parameter string (binary = base 2).
     int('0b' + a, 2)
   • int() function converts the string (e.g. '0b1101') to the decimal value and stores in the variable decimal_a. (e.g. '0b1101' converts to 13)
     decimal_a = int('0b' + a, 2)
   • Same thing happens with parameter b.
     decimal_b = int('0b' + b, 2)
   • Then both the decimal values are added and again converted to binary value string using python's bin() function.
     bin(decimal_a + decimal_b)
   • This generates a string with prefix '0b' (e.g. '0b10110'), which is sliced to keep the part after '0b'.
     [2:]
   • The resultant string representing the binary value is returned.

3. Removed semicolons in strings/int_to_roman.py file to resemble python syntax.

Any suggestions and feedback are welcomed.