fix parsing multi tool calls in stream_chunk_builder

[omerc7]

Title

Fix - parsing multi tool calls in stream_chunk_builder

Type

🐛 Bug Fix

Changes

Add index to last function call in stream_chunk_builder
Fix function name in multi tool calls

[REQUIRED] Testing

Did not find any tests with actual data parsing retuned from llm (or mock) in litellm/tests/test_stream_chunk_builder.py

In the print screens below the llm want to call

1. function name: aws-s3-list with no args
2. function name: aws-list-secrets with args: {"max_items": "3"}

Before:

After:

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 29, 2024 1:24pm

[tal-mogendorff]

Great PR, looks like you are working in an AI company

[krrishdholakia]

hey @omerc7 thank you for this pr. can you add a test for this in test_stream_chunk_builder.py + share a screenshot of it passing?