重构util接口，支持按照key查找json，并转换vector list

cheliequan

2023-01-13 946823215bac2c859df843f7b01636f5fda34ed4

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#!/bin/sh
#
# Doxygen markdown doesn't support triple-backticks like github does.
# Convert all of those to space-prefixed blocks instead.
#
awk '/```/ { prefix=!prefix; print ""; next; } { if (prefix) { printf "    "; } print $0; } ' "$@"