fix: use parsed integer num instead of rawNum in repeat helper loop

[sh1vam31]

Fixes #124

In src/helpers/repeat.ts, the repeat helper was using rawNum (a raw string) instead of num (the parsed integer) in the for loop condition.

After fix :

Problem

// Bug: rawNum is a string
for (let i = 0; i < rawNum; i++) {

[nishantwrp]

please add a unit test that fails without this change as well

[alondmnt]

Hey @sh1vam31, just a friendly reminder on the requested test: a case where the input is a non-numeric string (e.g., "abc") should suffice, since that's where rawNum and num diverge.