avoid excess string copy in auto loops
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@ -1136,7 +1136,7 @@ void Dump::modify_params(int narg, char **arg)
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} else if (strcmp(arg[iarg],"colname") == 0) {
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if (iarg+2 > narg) utils::missing_cmd_args(FLERR, "dump_modify colname", error);
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if (strcmp(arg[iarg+1],"default") == 0) {
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for (auto item : keyword_user) item.clear();
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for (auto &item : keyword_user) item.clear();
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iarg += 2;
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} else {
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if (iarg+3 > narg) utils::missing_cmd_args(FLERR, "dump_modify colname", error);
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