Remove leading space from key(s)

[Ohfalderal]

Leading space in string of elements key(s) returned from json_get_keys() should be suppressed / removed.

Parsing the returned string with shell parameter expansion(s) results in incorrect value(s) -

# json_get_keys _s
# $_s = ' key0 key1 key2'
echo ${_s#* } # ' key0 key1 key2'
echo ${_s# * } # 'key1 key2'