71e0f07e9c util: remove unused c-string variant of atoi64() (Sebastian Falbesoner)
Pull request description:
This is another micro-PR "removing old cruft with potentially sharp edges" (quote by practicalswift, see #19739). Gets rid of the c-string variant of the function `atoi64()`, which is only used in fuzzers and on one place with `wallet/wallet.h` (where it is originally a `std::string` anyways and uses `.c_str()` -- this method call can simply be removed.)
ACKs for top commit:
practicalswift:
ACK 71e0f07e9c -- diff looks correct
laanwj:
ACK 71e0f07e9c
Tree-SHA512: 4d1d28e2f5274fdbe0652e7a0f83dd416f4d19c1e1a49979927960a3ad40b0990eeaa4374656bf2c6998a965a14d62c1bc78303b7d583d3307c17828030a8e3b