Prep for Testing 4

Flash overflow fix
Attempted to concatent strings with snprintf:
- was orignally using strcat:
  - strcat has no way of anding buffer overflow
  - also, strcat finds where to add new string to the buffer by starting at the first index of the buffer and increasing the index until it finds a cell with a NULL character, this is inefficient
- snprintf keeps track of last non-NULL index and protects agains buffer overflow, but iin order to not cause Flash to overflow by 624 bytes, needed to change MCU/MPU GCC Compiler->Optimization->Optimization level from None (-O0) to Optimize for size (-Os), but this "optimizes out" some of the outputs in debug mode, making it difficult to use
Combined string using memcpy, before doing so I check that the lenght of the combined string will fit into the buffer, and keep track of the index of the last non-NULL value to increase efficiency

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