fn memcpySmall(noalias dest: ?[*]u8, noalias src: ?[*]const u8, len: usize) callconv(.c) ?[*]u8
fn memcpySmall(noalias dest: ?[*]u8, noalias src: ?[*]const u8, len: usize) callconv(.c) ?[*]u8 { @setRuntimeSafety(false); for (0..len) |i| { dest.?[i] = src.?[i]; } return dest; }