Avoid Printing Binary String to Logs (#1576)

Converts the graffiti binary data to string before printing to logs.

## Issue Addressed

#1566 

## Proposed Changes
Rather than converting graffiti to a vector the binary data less the last character is passed to String::from_utf_lossy(). This then allows us to call the to_string() function directly to give us the string

## Additional Info

Rust skills are fairly weak

Cargo.lock

@@ -348,6 +348,7 @@ dependencies = [
  "rand 0.7.3",
  "rand_core 0.5.1",
  "rayon",
+ "regex",
  "safe_arith",
  "serde",
  "serde_derive",