#include <Arduino_FreeRTOS.h>
#include <string.h>

void* custom_malloc(size_t size)
{
    void* ptr = NULL; 
    if(size > 0)
    {
        ptr = pvPortMalloc(size);
    }
    return ptr;
}
void setup() {
    Serial.begin(9600);
    char *c;
    c = (char *) custom_malloc(30 * sizeof(char));
    strcpy(c, "Hi everybody!");
    Serial.println(c);
}

void loop() {}