diff --git a/common/groupkv.hpp b/common/groupkv.hpp
new file mode 100644
index 000000000..694f822cf
--- /dev/null
+++ b/common/groupkv.hpp
@@ -0,0 +1,681 @@
+#pragma once
+
+/**
+ * Provides a simple direct 1-level only config file logic
+ * by Humans for All
+ * 
+ * ## File format
+ * 
+ * It can consist of multiple config groups.
+ * * the group name needs to start at the begining of the line.
+ * Each group can inturn contain multiple config fields (key:value pairs) wrt that group.
+ * * the group fields need to have 1 or more space at the begining of line.
+ * 
+ * ## Supported data types
+ * 
+ * The fields can have values belonging to ane one of the below types
+ * * strings - enclosed in double quotes
+ *             this is also the fallback catch all type, but dont rely on this behaviour.
+ * * int - using decimal number system
+ * * float - needs to have a decimal point and or e/E
+ *           if decimal point is used, there should be atleast one decimal number on its either side
+ * * bool - either true or false
+ * 
+ * It tries to provide a crude expanded form of array wrt any of the above supported types.
+ * For this one needs to define keys using the pattern TheKeyName-0, TheKeyName-1, ....
+ * 
+ * ## Additional notes
+ * 
+ * NativeCharSize encoded char refers to chars which fit within the size of char type in a given
+ * type of c++ string or base bitsize of a encoding standard, like 1 byte in case of std::string,
+ * utf-8, ...
+ * * example english alphabets in utf-8 encoding space are 1byte chars, in its variable length
+ *   encoding space.
+ * 
+ * MultiNativeCharSize encoded char refers to chars which occupy multiple base-char-bit-size of
+ * a c++ string type or char encoding standard.
+ * * example indian scripts alphabets in utf-8 encoding space occupy multiple bytes in its variable
+ *   length encoding space.
+ * 
+ * Sane variable length encoding - refers to encoding where the values of NativeCharSized chars of
+ * a char encoding space cant overlap with values in NativeCharSize subparts of MultiNativeCharSized
+ * chars of the same char encoding standard.
+ * * utf-8 shows this behaviour
+ * * chances are utf-16 and utf-32 also show this behaviour (need to cross check once)
+ */
+
+#include <map>
+#include <string>
+#include <vector>
+#include <fstream>
+#include <regex>
+#include <variant>
+#include <sstream>
+#include <cuchar>
+
+
+#define SC_DEBUG
+#undef SC_DEBUG_VERBOSE
+
+#define SC_TEST_PRG
+#ifdef SC_TEST_PRG
+#include <iostream>
+#include <format>
+#define LINFO_LN(FMT, ...) fprintf(stdout, FMT"\n", ##__VA_ARGS__)
+#define LDBUG(FMT, ...) fprintf(stderr, FMT, ##__VA_ARGS__)
+#define LDBUG_LN(FMT, ...) fprintf(stderr, FMT"\n", ##__VA_ARGS__)
+#define LERRR_LN(FMT, ...) fprintf(stderr, FMT"\n", ##__VA_ARGS__)
+#define LWARN_LN(FMT, ...) fprintf(stderr, FMT"\n", ##__VA_ARGS__)
+#else
+#include "log.h"
+#define LINFO_LN LOG_TEELN
+#define LDBUG LOG
+#define LDBUG_LN LOGLN
+#define LERRR_LN LOG_TEELN
+#define LWARN_LN LOG_TEELN
+#endif
+
+#undef SC_STR_OVERSMART
+#ifdef SC_STR_OVERSMART
+#define str_trim str_trim_oversmart
+#else
+#define str_trim str_trim_dumb
+#endif
+
+
+// **** **** **** String related helpers **** **** **** //
+
+
+size_t wcs_to_mbs(std::string &sDest, const std::wstring &wSrc) {
+    std::mbstate_t mbState = std::mbstate_t();
+    const wchar_t *wSrcP = wSrc.c_str();
+    auto reqLen = std::wcsrtombs(nullptr, &wSrcP, 0, &mbState);
+    sDest.resize(reqLen);
+    return std::wcsrtombs(sDest.data(), &wSrcP, sDest.length(), &mbState);
+}
+
+size_t mbs_to_wcs(std::wstring &wDest, const std::string &sSrc) {
+    std::mbstate_t mbState = std::mbstate_t();
+    const char *sSrcP = sSrc.c_str();
+    auto reqLen = std::mbsrtowcs(nullptr, &sSrcP, 0, &mbState);
+    wDest.resize(reqLen);
+    return std::mbsrtowcs(wDest.data(), &sSrcP, wDest.length(), &mbState);
+}
+
+template <typename TString>
+void dumphex_string(const TString &sIn, const std::string &msgTag){
+    LDBUG("%s[ ", msgTag.c_str());
+    for(auto c: sIn) {
+        auto cSize = sizeof(c);
+        if (cSize == 1) {
+            LDBUG("%02x, ", (uint8_t)c);
+        } else if (cSize == 2) {
+            LDBUG("%04x, ", (uint16_t)c);
+        } else if (cSize == 4) {
+            LDBUG("%08x, ", (uint32_t)c);
+        } else {
+            std::stringstream ss;
+            ss << "ERRR:" << __func__ << ":Unsupported char type with size [" << cSize << "]";
+            throw std::runtime_error( ss.str().c_str() );
+        }
+    }
+    LDBUG_LN(" ]");
+}
+
+// Remove chars from begin and end of the passed string, provided the char
+// belongs to one of the chars in trimChars.
+//
+// NOTE: This will work perfectly provided the string being trimmed as well as
+// chars being trimmed are made up of NativeCharSize chars from same encoded space.
+// For utf-8, this means the ascii equivalent 1byteSized chars of utf8 and not
+// variable length MultiNativeCharSize (ie multibye in case of utf-8) ones.
+// NOTE: It will also work, if atleast either end of string as well as trimChars
+// have NativeCharSize chars from their encoding space, rather than variable
+// length MultiNativeCharSize based chars if any. There needs to be NativeCharSized
+// chars beyond any chars that get trimmed, on either side.
+//
+// NOTE: Given the way UTF-8 char encoding is designed, where NativeCharSize 1byte
+// encoded chars are fully unique and dont overlap with any bytes from any of the
+// variable length MultiNativeCharSize encoded chars in the utf-8 space, so as long as
+// the trimChars belong to NativeCharSize chars subset, the logic should work, even
+// if string has a mixture of NativeCharSize and MultiNativeCharSize encoded chars.
+// Chances are utf-16 and utf-32 also have similar characteristics wrt thier
+// NativeCharSize encoded chars (ie those fully encoded within single 16bit and 32bit 
+// value respectively), and so equivalent semantic applies to them also.
+//
+// ALERT: Given that this simple minded logic, works at individual NativeCharSize level
+// only, If trimChars involve variable length MultiNativeCharSize encoded chars, then
+// * because different NativeCharSize subparts (bytes in case of utf-8) from different
+//   MultiNativeCharSize trim chars when clubbed together can map to some other new char
+//   in a variable length encoded char space, if there is that new char at either end
+//   of the string, it may get trimmed, because of the possibility of mix up mentioned.
+// * given that different variable length MultiNativeCharSize encoded chars may have
+//   some common NativeCharSize subparts (bytes in case of utf-8) between them, if one
+//   of these chars is at either end of the string and another char is in trimChars,
+//   then string may get partially trimmed wrt such a char at either end.
+//
+template <typename TString>
+TString str_trim_dumb(TString sin, const TString &trimChars=" \t\n") {
+#ifdef SC_DEBUG_VERBOSE
+    dumphex_string(sin, "DBUG:StrTrimDumb:Str:");
+    dumphex_string(trimChars, "DBUG:StrTrimDumb:TrimChars:");
+#endif
+    sin.erase(sin.find_last_not_of(trimChars)+1);
+    sin.erase(0, sin.find_first_not_of(trimChars));
+    return sin;
+}
+
+// Remove chars from begin and end of the passed string, provided the char belongs
+// to one of the chars in trimChars.
+// NOTE: Internally converts to wchar/wstring to try and support proper trimming,
+// wrt possibly more languages, to some extent. IE even if the passed string
+// contains multibyte encoded characters in it in utf-8 space (ie MultiNativeCharSize),
+// it may get converted to NativeCharSize chars in the expanded wchar_t encoding space,
+// thus leading to fixed NativeCharSize driven logic itself handling things sufficiently.
+// Look at str_trim_dumb comments for additional aspects.
+std::string str_trim_oversmart(std::string sIn, const std::string &trimChars=" \t\n") {
+    std::wstring wIn;
+    mbs_to_wcs(wIn, sIn);
+    std::wstring wTrimChars;
+    mbs_to_wcs(wTrimChars, trimChars);
+    auto wOut = str_trim_dumb(wIn, wTrimChars);
+    std::string sOut;
+    wcs_to_mbs(sOut, wOut);
+    return sOut;
+}
+
+// Remove atmost 1 char at the begin and 1 char at the end of the passed string,
+// provided the char belongs to one of the chars in trimChars.
+//
+// NOTE: Chars being trimmed (ie in trimChars) needs to be part of NativeCharSize
+// subset of the string's encoded char space, to avoid mix up when working with
+// strings which can be utf-8/utf-16/utf-32/sane-variable-length encoded strings.
+//
+// NOTE:UTF8: This will work provided the string being trimmed as well the chars
+// being trimmed are made up of 1byte encoded chars in case of utf8 encoding space.
+// If the string being trimmed includes multibyte (ie MultiNativeCharSize) encoded
+// characters at either end, then trimming can mess things up, if you have multibyte
+// encoded utf-8 chars in the trimChars set.
+//
+// Currently given that SimpCfg only uses this with NativeCharSize chars in the
+// trimChars and most of the platforms are likely to be using utf-8 based char
+// space (which is a realtively sane variable length char encoding from this
+// logics perspective), so not providing oversmart variant.
+//
+template <typename TString>
+TString str_trim_single(TString sin, const TString& trimChars=" \t\n") {
+    if (sin.empty()) return sin;
+    for(auto c: trimChars) {
+        if (c == sin.front()) {
+            sin = sin.substr(1, TString::npos);
+            break;
+        }
+    }
+    if (sin.empty()) return sin;
+    for(auto c: trimChars) {
+        if (c == sin.back()) {
+            sin = sin.substr(0, sin.length()-1);
+            break;
+        }
+    }
+    return sin;
+}
+
+// Convert to lower case, if language has upper and lower case semantic
+//
+// This works for fixed size encoded char spaces.
+//
+// For variable length encoded char spaces, it can work
+// * if one is doing the conversion for languages which fit into NativeCharSized chars in it
+// * AND if one is working with a sane variable length encoding standard
+// * ex: this will work if trying to do the conversion for english language within utf-8
+//
+template <typename TString>
+TString str_tolower(const TString &sin) {
+    TString sout;
+    sout.resize(sin.size());
+    std::transform(sin.begin(), sin.end(), sout.begin(), [](auto c)->auto {return std::tolower(c);});
+#ifdef SC_DEBUG_VERBOSE
+    dumphex_string(sin, "DBUG:StrToLower:in:");
+    dumphex_string(sout, "DBUG:StrToLower:out:");
+#endif
+    return sout;
+}
+
+void str_compare_dump(const std::string &s1, const std::string &s2) {
+    LDBUG_LN("DBUG:%s:%s:Len:%zu", __func__, s1.c_str(), s1.length());
+    LDBUG_LN("DBUG:%s:%s:Len:%zu", __func__, s2.c_str(), s2.length());
+    int minLen = s1.length() < s2.length() ? s1.length() : s2.length();
+    for(int i=0; i<minLen; i++) {
+        LDBUG_LN("DBUG:%s:%d:%c:%c", __func__, i, s1[i], s2[i]);
+    }
+}
+
+
+template<typename TypeWithStrSupp>
+std::string str(TypeWithStrSupp value) {
+    std::stringstream ss;
+    ss << value;
+    return ss.str();
+}
+
+template<typename TypeWithStrSupp>
+std::string str(std::vector<TypeWithStrSupp> values) {
+    std::stringstream ss;
+    ss << "[ ";
+    int cnt = 0;
+    for(auto value: values) {
+        cnt += 1;
+        if (cnt != 1) ss << ", ";
+        ss << value;
+    }
+    ss << " ]";
+    return ss.str();
+}
+
+
+// **** **** **** the SimpCfg **** **** **** //
+
+
+typedef std::variant<std::string, bool, int64_t, double> SimpCfgData;
+typedef std::vector<std::string> MultiPart;
+typedef std::map<std::string, std::map<std::string, SimpCfgData>> SimpCfgMapMapVariant;
+
+class SimpCfg {
+
+private:
+    SimpCfgMapMapVariant mapV = {};
+    std::regex rInt {R"(^[-+]?\d+$)"};
+    std::regex rFloat {R"(^[-+]?\d+(?:\.\d+)?(?:[eE][-+]?\d+)?$)"};
+
+public:
+
+    SimpCfg(SimpCfgMapMapVariant defaultMap) : mapV(defaultMap) {}
+
+    static std::string joiner(const MultiPart& parts) {
+        std::stringstream joined;
+        int iCnt = 0;
+        for(auto part: parts) {
+            if (iCnt != 0) {
+                joined << "-";
+            }
+            iCnt += 1;
+            joined << part;
+        }
+        return joined.str();
+    }
+
+    std::string to_str(const SimpCfgData &value) {
+        auto visitor = [](auto value) -> auto {
+            std::stringstream ss;
+            ss << value;
+            return ss.str();
+        };
+        return std::visit(visitor, value);
+    }
+
+    template<typename SupportedDataType>
+    void set_value(const std::string &group, const MultiPart &keyParts, const SupportedDataType &value, const std::string &callerName="") {
+        auto key = joiner(keyParts);
+        auto &gm = mapV[group];
+        gm[key] = value;
+#ifdef SC_DEBUG
+        LDBUG_LN("DBUG:SC:%s_%s:%s:%s:%s", __func__, callerName.c_str(), group.c_str(), key.c_str(), to_str(value).c_str());
+#endif
+    }
+
+    void set_string(const std::string &group, const MultiPart &keyParts, const std::string &value) {
+        set_value(group, keyParts, value, __func__);
+    }
+
+    void set_bool(const std::string &group, const MultiPart &keyParts, bool value) {
+        set_value(group, keyParts, value, __func__);
+    }
+
+    void set_bool(const std::string &group, const MultiPart &keyParts, const std::string &value) {
+        std::string sValue = str_tolower(value);
+        bool bValue = sValue == "true" ? true : false;
+        //LDBUG_LN("DBUG:%s:%s:%s:%d", __func__, value.c_str(), sValue.c_str(), bValue);
+        set_bool(group, keyParts, bValue);
+    }
+
+    void set_int64(const std::string &group, const MultiPart &keyParts, int64_t value) {
+        set_value(group, keyParts, value, __func__);
+    }
+
+    void set_int64(const std::string &group, const MultiPart &keyParts, std::string &value) {
+        auto ivalue = strtoll(value.c_str(), nullptr, 0);
+        set_int64(group, keyParts, ivalue);
+    }
+
+    void set_double(const std::string &group, const MultiPart &keyParts, double value) {
+        set_value(group, keyParts, value, __func__);
+    }
+
+    void set_double(const std::string &group, const MultiPart &keyParts, std::string &value) {
+        auto dvalue = strtod(value.c_str(), nullptr);
+        set_double(group, keyParts, dvalue);
+    }
+
+    // Dump info about the specified group.
+    // If group is empty, then dump info about all groups maintained in this instance.
+    void dump(const std::string &group) {
+        for (auto gm: mapV) {
+            if (!group.empty() && (gm.first != group)) {
+                LINFO_LN("INFO:SC:%s:%s:Skipping...", __func__, gm.first.c_str());
+                continue;
+            }
+            for(auto k: gm.second) {
+                LINFO_LN("DBUG:SC:%s:%s:Iterate:%s:%s", __func__, gm.first.c_str(), k.first.c_str(), to_str(k.second).c_str());
+            }
+        }
+    }
+
+    template<typename SupportedDataType>
+    SupportedDataType get_value(const std::string &group, const MultiPart &keyParts, const SupportedDataType &defaultValue, const std::string &callerName="") {
+        auto key = joiner(keyParts);
+        auto gm = mapV[group];
+        if (gm.find(key) == gm.end()) {
+#ifdef SC_DEBUG
+            LWARN_LN("WARN:SC:%s_%s:%s:%s:%s[default]", __func__, callerName.c_str(), group.c_str(), key.c_str(), to_str(defaultValue).c_str());
+#endif
+            return defaultValue;
+        }
+        auto value = gm[key];
+#ifdef SC_DEBUG
+        LDBUG_LN("DBUG:SC:%s_%s:%s:%s:%s", __func__, callerName.c_str(), group.c_str(), key.c_str(), to_str(value).c_str());
+#endif
+        return std::get<SupportedDataType>(value);
+    }
+
+    std::string get_string(const std::string &group, const MultiPart &keyParts, const std::string &defaultValue) {
+        return get_value(group, keyParts, defaultValue, __func__);
+    }
+
+    bool get_bool(const std::string &group, const MultiPart &keyParts, bool defaultValue) {
+        return get_value(group, keyParts, defaultValue, __func__);
+    }
+
+    int64_t get_int64(const std::string &group, const MultiPart &keyParts, int64_t defaultValue) {
+        return get_value(group, keyParts, defaultValue, __func__);
+    }
+
+    double get_double(const std::string &group, const MultiPart &keyParts, double defaultValue) {
+        return get_value(group, keyParts, defaultValue, __func__);
+    }
+
+
+    template<typename SupportedDataType>
+    std::vector<SupportedDataType> get_vector(const std::string &group, const MultiPart &keyParts, const std::vector<SupportedDataType> &defaultValue, const std::string &callerName="") {
+        auto key = joiner(keyParts);
+        auto gm = mapV[group];
+        std::vector<SupportedDataType> array;
+        int i = 0;
+        while(true) {
+            std::stringstream ssArrayKey;
+            ssArrayKey << key << "-" << i;
+            auto arrayKey = ssArrayKey.str();
+            if (gm.find(arrayKey) == gm.end()) {
+                break;
+            }
+            array.push_back(std::get<SupportedDataType>(gm[arrayKey]));
+            i += 1;
+        }
+        if (array.empty()) {
+            LWARN_LN("DBUG:SC:%s_%s:%s:%s:%s[default]", __func__, callerName.c_str(), group.c_str(), key.c_str(), str(defaultValue).c_str());
+            return defaultValue;
+        }
+        LDBUG_LN("DBUG:SC:%s_%s:%s:%s:%s", __func__, callerName.c_str(), group.c_str(), key.c_str(), str(array).c_str());
+        return array;
+    }
+
+    static void locale_prepare(std::string &sSavedLocale) {
+        sSavedLocale = std::setlocale(LC_ALL, nullptr);
+        auto sUpdatedLocale = std::setlocale(LC_ALL, "en_US.UTF-8");
+        LDBUG_LN("DBUG:%s:Locale:Prev:%s:Cur:%s", __func__, sSavedLocale.c_str(), sUpdatedLocale);
+    }
+
+    static void locale_restore(const std::string &sSavedLocale) {
+        auto sCurLocale = std::setlocale(LC_ALL, sSavedLocale.c_str());
+        LDBUG_LN("DBUG:%s:Locale:Requested:%s:Got:%s", __func__, sSavedLocale.c_str(), sCurLocale);
+    }
+
+    void load(const std::string &fname) {
+        std::ifstream f {fname};
+        if (!f) {
+            LERRR_LN("ERRR:SC:%s:%s:failed to load...", __func__, fname.c_str());
+            throw std::runtime_error { "ERRR:SimpCfg:File not found" };
+        } else {
+            LDBUG_LN("DBUG:SC:%s:%s", __func__, fname.c_str());
+        }
+        std::string group;
+        int iLine = 0;
+        while(!f.eof()) {
+            iLine += 1;
+            std::string curL;
+            getline(f, curL);
+            if (curL.empty()) {
+                continue;
+            }
+            if (curL[0] == '#') {
+                continue;
+            }
+            bool bGroup = !isspace(curL[0]);
+            curL = str_trim(curL);
+            if (bGroup) {
+                curL = str_trim_single(curL, {"\""});
+                group = curL;
+                LDBUG_LN("DBUG:SC:%s:group:%s", __func__, group.c_str());
+                continue;
+            }
+            auto dPos = curL.find(':');
+            if (dPos == std::string::npos) {
+                LERRR_LN("ERRR:SC:%s:%d:invalid key value line:%s", __func__, iLine, curL.c_str());
+                throw std::runtime_error { "ERRR:SimpCfg:Invalid key value line" };
+            }
+            auto dEnd = curL.length() - dPos;
+            if ((dPos == 0) || (dEnd < 2)) {
+                LERRR_LN("ERRR:SC:%s:%d:invalid key value line:%s", __func__, iLine, curL.c_str());
+                throw std::runtime_error { "ERRR:SimpCfg:Invalid key value line" };
+            }
+            std::string key = curL.substr(0, dPos);
+            key = str_trim(key);
+            key = str_trim_single(key, {"\""});
+            std::string value = curL.substr(dPos+1);
+            value = str_trim(value);
+            value = str_trim(value, {","});
+            std::string vtype = "bool";
+            auto valueLower = str_tolower(value);
+            if ((valueLower.compare("true") == 0) || (valueLower == "false")) {
+                set_bool(group, {key}, value);
+            } else if (std::regex_match(value, rInt)) {
+                vtype = "int";
+                set_int64(group, {key}, value);
+            } else if (std::regex_match(value, rFloat)) {
+                vtype = "float";
+                set_double(group, {key}, value);
+            } else {
+                vtype = "string";
+                if (!value.empty() && (value.front() != '"')) {
+                    LWARN_LN("WARN:SC:%s:%d:%s:k:%s:v:%s:is this string?", __func__, iLine, group.c_str(), key.c_str(), value.c_str());
+                }
+                value = str_trim_single(value, {"\""});
+                set_string(group, {key}, value);
+            }
+            //LDBUG_LN("DBUG:SC:%s:%d:kv:%s:%s:%s:%s", __func__, iLine, group.c_str(), key.c_str(), vtype.c_str(), value.c_str());
+        }
+    }
+
+};
+
+
+#ifdef SC_TEST_PRG
+
+
+// **** **** **** some simple test code **** **** **** //
+
+
+void check_string() {
+    std::vector<std::string> vStandard = { "123", "1अ3" };
+    std::cout << "**** string **** " << vStandard.size() << std::endl;
+    for(auto sCur: vStandard) {
+        std::cout << std::format("string: [{}] len[{}] size[{}]", sCur, sCur.length(), sCur.size()) << std::endl;
+        int i = 0;
+        for(auto c: sCur) {
+            std::cout << std::format("string:{}:pos:{}:char:{}[0x{:x}]\n", sCur, i, c, (uint8_t)c);
+            i += 1;
+        }
+    }
+}
+
+void check_u8string() {
+    std::vector<std::u8string> vU8s = { u8"123", u8"1अ3" };
+    std::cout << "**** u8string **** " << vU8s.size() << std::endl;
+    for(auto sCur: vU8s) {
+        std::string sCurx (sCur.begin(), sCur.end());
+        std::cout << std::format("u8string: [{}] len[{}] size[{}]", sCurx, sCur.length(), sCur.size()) << std::endl;
+        int i = 0;
+        for(auto c: sCur) {
+            //std::cout << c << std::endl;
+            std::cout << std::format("u8string:{}:pos:{}:char:{}[0x{:x}]\n", sCurx, i, (unsigned char)c, (unsigned char)c);
+            i += 1;
+        }
+    }
+}
+
+void check_wstring_wcout() {
+    std::wcout.imbue(std::locale("en_US.UTF-8"));
+    std::vector<std::wstring> vWide = { L"123", L"1अ3" };
+    std::cout << "**** wstring wcout **** " << vWide.size() << std::endl;
+    for(auto sCur: vWide) {
+        std::wcout << sCur << std::endl;
+        std::wcout << std::format(L"wstring: [{}] len[{}] size[{}]", sCur, sCur.length(), sCur.size()) << std::endl;
+        int i = 0;
+        for(auto c: sCur) {
+            std::wcout << std::format(L"wstring:{}:pos:{}:char:{}[0x{:x}]\n", sCur, i, c, c);
+            i += 1;
+        }
+    }
+}
+
+void check_wstring_cout() {
+    std::vector<std::wstring> vWide = { L"123", L"1अ3" };
+    std::cout << "**** wstring cout **** " << vWide.size() << std::endl;
+    for(auto sCur: vWide) {
+        std::string sCury;
+        wcs_to_mbs(sCury, sCur);
+        std::cout << std::format("wstring: [{}] len[{}] size[{}]", sCury, sCur.length(), sCur.size()) << std::endl;
+        int i = 0;
+        for(auto c: sCur) {
+            std::wstringstream wsc;
+            wsc << c;
+            std::string ssc;
+            wcs_to_mbs(ssc, wsc.str());
+            std::cout << std::format("wstring:{}:pos:{}:char:{}[0x{:x}]\n", sCury, i, ssc, (uint32_t)c);
+            i += 1;
+        }
+    }
+}
+
+void check_nonenglish() {
+    std::cout << "**** non english **** " << std::endl;
+    std::vector<std::string> vTest1 = { "\n\tAഅअಅ\n\t", "\n\tAഅअಅ " };
+    for (auto sTest: vTest1) {
+        std::string sGotDumb = str_trim_dumb(sTest, {" \n\t"});
+        std::string sGotOSmart = str_trim_oversmart(sTest, {" \n\t"});
+        std::string sLower = str_tolower(sTest);
+        std::cout << std::format("{}: Test1 [{}]\n\tTrimDumb[{}]\n\tTrimOverSmart[{}]\n\tLowerDumb[{}]", __func__, sTest, sGotDumb, sGotOSmart, sLower) << std::endl;
+    }
+    // The string "\n\tthis र remove 0s and अs at end 000रअ0\xa4अ ",
+    // * will mess up str_trim_dumb,
+    // * but will rightly trigger a exception with oversmart.
+    std::vector<std::string> vTest2 = { "\n\t this र remove 0s at end 000 ", "\n\tthis र remove 0s, अs, ഇs at end 000रअ0अ ", "\n\tthis र remove 0s, अs, ഇs at end 000रअ0इअ "};
+    std::string trimChars = {" \n\tഇ0अ"};
+    for (auto sTest: vTest2) {
+        std::string sGotDumb = str_trim_dumb(sTest, trimChars);
+        std::string sGotOSmart = str_trim_oversmart(sTest, trimChars);
+        std::cout << std::format("{}: Test2 [{}]\n\tDumb[{}]\n\tOverSmart[{}]", __func__, sTest, sGotDumb, sGotOSmart) << std::endl;
+    }
+}
+
+void check_strings() {
+    std::string sSavedLocale;
+    SimpCfg::locale_prepare(sSavedLocale);
+    check_string();
+    check_u8string();
+    //check_wstring_wcout();
+    check_wstring_cout();
+    check_nonenglish();
+    SimpCfg::locale_restore(sSavedLocale);
+}
+
+void sc_inited() {
+    SimpCfg sc = {{
+        {"Group1",{
+            {"testkey11", 11},
+            {"testkey12", true}
+        }},
+        {"Group2", {
+            {"key21", "val21"},
+            {"key22", 22},
+            {"key23", 2.3}
+        }}
+    }};
+
+    std::cout << "**** sc inited **** " << std::endl;
+    sc.dump("");
+
+}
+
+void sc_set(const std::string &fname) {
+
+    std::cout << "**** sc set **** " << std::endl;
+    SimpCfg sc = {{}};
+    sc.load(fname);
+    sc.dump("");
+
+    sc.get_bool("testme", {"key101b"}, false);
+    sc.get_string("testme", {"key101s"}, "Not found");
+    sc.get_int64("testme", {"key101i"}, 123456);
+    sc.get_double("testme", {"key101d"}, 123456.789);
+
+    sc.set_bool("testme", {"key201b"}, true);
+    sc.set_string("testme", {"key201s"}, "hello world");
+    sc.set_int64("testme", {"key201i"}, 987654);
+    sc.set_double("testme", {"key201d"}, 9988.7766);
+
+    sc.dump("testme");
+    sc.get_bool("testme", {"key201b"}, false);
+    sc.get_string("testme", {"key201s"}, "Not found");
+    sc.get_int64("testme", {"key201i"}, 123456);
+    sc.get_double("testme", {"key201d"}, 123456.789);
+
+    sc.get_string("mistral", {"system-prefix"}, "Not found");
+    sc.get_string("\"mistral\"", {"\"system-prefix\""}, "Not found");
+
+    sc.get_vector<int64_t>("testme", {"keyA100"}, {1, 2, 3});
+    sc.get_vector<std::string>("testme", {"keyA100"}, { "A", "അ", "अ", "ಅ" });
+    sc.set_int64("testme", {"keyA300-0"}, 330);
+    sc.set_int64("testme", {"keyA300-1"}, 331);
+    sc.set_int64("testme", {"keyA300-2"}, 332);
+    sc.set_string("testme", {"keyA301-0"}, "India");
+    sc.set_value<std::string>("testme", {"keyA301", "1"}, "World");
+    sc.set_string("testme", {"keyA301", "2"}, "AkashaGanga");
+    sc.get_vector<int64_t>("testme", {"keyA300"}, {1, 2, 3});
+    sc.get_vector<std::string>("testme", {"keyA301"}, { "yes 1", "No 2", "very well 3" });
+}
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        LERRR_LN("USAGE:%s simp.cfg", argv[0]);
+        exit(1);
+    }
+
+    check_strings();
+    sc_inited();
+    std::string fname {argv[1]};
+    sc_set(fname);
+
+    return 0;
+}
+#endif