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Use char overloads to Join/Index strings
Use char overloads to Join/Index strings
Use overloads that take a char for single-character strings.
Description
Use overloads that take a char for single-character strings where relevant with string.Join() or {Last}IndexOf() to resolve a number of analyser suggestions.
Also fixes a few IDE0055 diagnostics.
CI failure looks unrelated - that analyzer has been failing in a lot of runs.
Edit: Oh fancy, we have a bot to tag known failures now?
/azp run
Azure Pipelines successfully started running 3 pipeline(s).