Given a string x, return the sum of all ASCII numbers of all characters.
for example, if x='lala' ('l'-> 108, 'a'->97) then y = 108+97+108+97
Swap the first and last columns
Number of 1s in a binary string
Do Fast Fourier Transformation
length of a vector
factorial of a number x
Add the positive numbers
Add the odd numbers
Connect 4 (the boardgame)
Second smallest number
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