let testEncodeOuput="000111000111000111000000000000111111111111111111000111111111000000111111000111111111000111000000000000111000000000000111000000111000000111000111"
let myEncodeOuput="000111000111000111000000000000111111111111111111000111111111000000111111000111111111000111000000000000111000000000000111000000111000000111000111"
let theirDecodeInput="000111000111000111000010000000111111111111011111000111111111000000111111000111101111000111000000000000111000000000000111000000111000000111000111"
in last test case they are giving wrong input but expecting same result as input of encode function .Here my encode output and their are same,but in decode function they are giving different input than output of encode funtion.

findNumber(1, 21, "2198765123416171890101112131415")
from this i got [20] instead of [12,21] ,more over i can see 21 and 12 both are present in the string .How this gonna work?

may be test's are different now,that's why your solution won't pass all the test's.

Can anyone help me out?

// assert.strictEqual(runningPace(2.51, "10:43"), "4:16");

here I got "4:12" instead of "4:16",