multiOTPCredentialProvider | multiOTP Credential Provider is a V2 Credential | Authentication library

i am trying to use a .dll in windows to test custom login in windows. This is the source of dll.

Note: This is more of a general debugging question(& the working of .dll plugin i am using might not be required)

The Dll loads fine ( i can visually verify this on windows logon screen) But when i enter the password & Otp and submit it gives an error saying stack around the variable onelinew is corrupted. as far as i can tell this means its either because of writing too much data than the buffer can hold or trying to reference something that isn't in memory?.

I tried to attach the windbg debugger to find the source of stack corruption & tried to look at various things like stack frames/call stacks/register values...etc .but i am stuck on how to make sense of this as i a bit new to this style of debugging(2 days now).

i will attach a screen shot of error and stack calls , hopefully someone can tell where to go on from here.

The last log in the log file created by this plugin is MultiotpCredential::Dll compiled with SKIP_OTP_CHECK !!!!!!!!" which is defined here

the variable onelinew which is appering in error box is defined here as: