iban: Simplify + style
json: style
knapsack 0-1: style
letter frequency: style
markov algorithm: style
power set: reduce clones + style
primality trial div: style
prime decomposition: spacing
quicksort: style
range expansion: reduce allocations + style
reverse words str: style
RLE: handle failure condition + style
sieve eratosthenes: style
string concat: fix comments
string interpolation: style
sync concurrency: style
stack: style
zigzag matrix: style