#include "Arduino.h"
#include <vector>
std::vector<char*>  v_audioContent;
using namespace std;
void vector_clear_and_shrink(vector<char*>&vec);

void setup() {
    Serial.begin(115200);
    uint32_t ms=millis();
 
Serial.println("BEGIN------------------------");

mem();
for (uint8_t f=0;f<10;f++)
{
add();
    while(v_audioContent.size() > 0){
        const char* s = (const char*)v_audioContent[v_audioContent.size() -1];
      Serial.printf("%s\n", s);
        v_audioContent.pop_back();
    }

   if(v_audioContent.size() == 0)
           vector_clear_and_shrink(v_audioContent); // free memory
Serial.print("FOR------------------------:");
Serial.println(f);
  mem();
}


Serial.println("END VECTOR------------------------");
mem();

Serial.print("TIME:");Serial.println(millis()-ms);
}

void loop(){
delay(1000);
}

void add(){
 String ruString;
for(int n=0;n<1000;n++)
{
ruString=String(n);
v_audioContent.insert(v_audioContent.begin(),strdup(ruString.c_str()));
}
}

void vector_clear_and_shrink(vector<char*>&vec)
{
  //  uint size = vec.size();
    uint size = vec.capacity();
    for (int i = 0; i < size; i++) {
        if(vec[i]){
            free(vec[i]);
            vec[i] = NULL;
        }
    }
    vec.clear();
    vec.shrink_to_fit();
}

//-----------------------------MEM
void mem()
{

  uint32_t freeHeapBytes = heap_caps_get_free_size(MALLOC_CAP_DEFAULT);
  uint32_t totalHeapBytes = heap_caps_get_total_size(MALLOC_CAP_DEFAULT);
  float percentageHeapFree = freeHeapBytes * 100.0f / (float)totalHeapBytes;
  // Print to serial
  Serial.printf("[Memory] %.1f%% free - %d of %d bytes free\n", percentageHeapFree, freeHeapBytes, totalHeapBytes);
  uint32_t Free = ESP.getFreeHeap();
  uint32_t  alloc = ESP.getMaxAllocHeap();
  Serial.print("Free:"); Serial.print(Free);
  Serial.print(" alloc:"); Serial.println(alloc);

}