Everybody who owns an Arduino (Uno and Mega mostly, however other models also fit this require), should have notice those set of pins he never had used and  think would never will (at least I thought that), until  I had to store another Arduino’s bootloader or even, for any other reason, need to program another Arduino through a working Arduino ( Arduino as a programmer ) .
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The String class, not the char arrays, but that ones declared as |String str = “some text”|, are really poisonous to an Arduino program.

You probably gonna think something like “But they are so nice, I don’t need to explicitly allocate them, I can concatenate them like I do in Java or Javascript, …”

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