feat: change and add theorems on String
#128
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* Rename the theorem `String.addString_eq` `String.addString_byteIdx`. * Add three new theorems: `String.addString_eq`, `String.zero_addString_eq`, and `String.drop_empty`.
digama0
reviewed
May 3, 2023
Add `String.ext` and `String.ext_iff`.
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String.addString_eqString.addString_byteIdx.Data.Nat.LemmasandData.String.Lemmas.Mathlib.Data.String.Basicto here.