guessed_owner_name = {
const name_tallies = venmo_statements
.map(s => [s.From, s.To])
.flat()
.reduce((tally, name) => Object.assign(tally, {[name]: (tally[name] || 0) + 1}), {})
const [most_popular, count] = Object.entries(name_tallies).sort((n1, n2) => n2[1] - n1[1])[0]
return most_popular
}