Fix for issue "Wrong delta"

[mbuptivo]

Tested with node v22.14.0 (LTS)
Fixes issue #4

Before fix:

INPUT IN CHAT: Hello

DELTA **Hello! How can I assist you today <- should be "Hello"**
DELTA !
DELTA  How
DELTA  can
DELTA  I
DELTA  assist
DELTA  you
DELTA  today
DELTA ?

RESULT IN CHAT: Hello! How can I assist you tod**ay! How** can I assist you today?

INPUT IN CHAT: How can you help me?

DELTA **I can assist you with <- should be "I"**
DELTA  can
DELTA  assist
DELTA  you
DELTA  with
DELTA  a
DELTA  wide
DELTA  range
DELTA  of
DELTA  tasks
...

RESULT IN CHAT: I can assist you **with can as**sist you with a wide range of tasks...

After fix:

INPUT IN CHAT: Hello

DELTA Hi
DELTA  there
DELTA !
DELTA  How
DELTA  can
DELTA  I
DELTA  assist
DELTA  you
DELTA  today
DELTA ?

RESULT IN CHAT: Hi there! How can I assist you today?