const str1 = 'asdqwdad1'
const str2 = 'asd22332'
const str3 = 'asdcccc'
const fn1 = (str1, str2) => {
let res = ''
for(let i = 0; i < str1.length; i++){
for(let j = i; j < str1.length; j++){
let str = str1.substring(i, j + 1)
if(str2.indexOf(str) !== -1 && str.length > res.length){
res = str
}
}
}
return res
}
const fn2 = (...args) => {
return args.reduce((acc, curr) => {
acc = fn1(acc, curr)
return acc
})
}
console.log(fn2(str1, str2, str3))