Fix #63, Remove initializations causing Cppcheck errors

[thnkslprpt]

Checklist

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
Fixes #63
Both seem fine to change from initialization at the top of the function to a plain declaration.
TempAtsChar is used in only one location, and that is after a mutually exclusive if/else which assigns it a value in both cases.
IndexDelta is used inside just one if block, and is assigned a value (on line 409) before any of the 3 references to it are made.

Testing performed
GitHub CI actions (incl. Build + Run, Unit Tests etc.) all passing successfully.

Expected behavior changes
No impact on code behavior.
Cppcheck now passes without error again.

Contributor Info
Avi @thnkslprpt

[jphickey]

Thanks for implementing, we should merge this, as it fixes one of the workflow errors in main branch.