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Here is a look at what would be involved:

println(s); // Hello World — original unchanged，这一点在新收录的资料中也有详细论述

，这一点在新收录的资料中也有详细论述

x := int_from_string(a)?;。新收录的资料对此有专业解读

printf("gcd(48, 18) = %lld\n", gcd_result.data.i); // 6