Fix parsing error in Autogen CurrentMessage

[davorrunje]

Description

Fixes parsing error caused by variable number of stars outputted by AutoGen IOStream classes

Fixes #200

Type of change

Please delete options that are not relevant.

• [x] Bug fix (a non-breaking change that resolves an issue)

Checklist

• [x] My code adheres to the style guidelines of this project (scripts/lint.sh shows no errors)
• [x] I have conducted a self-review of my own code
• [ ] I have made the necessary changes to the documentation
• [x] My changes do not generate any new warnings
• [ ] I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• [x] Both new and existing unit tests pass successfully on my local environment by running scripts/test-cov.sh
• [x] I have ensured that static analysis tests are passing by running scripts/static-anaylysis.sh
• [ ] I have included code examples to illustrate the modifications

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
fastagency/runtime/autogen/base.py	94.25% <100.00%> (+0.06%)	:arrow_up: