I am unable to find out the memcheck error when i using valgrind on the given code

Question

I am unable to detect the memory error(memcheck error) . when i run the code i see some unexpected output came. so please describe what is happening in thes code.

#include <stdio.h>
#include <stdlib.h>

char *getString()
{
    char message[100]="Hello World";
    char *ret = message;
    return ret;
}
void test4()
{
    printf("String: %s",getString());
}
int main()
{
    
    test4();
    return 0;
}

Answer 1

Your variable message is local to the function getString and is on the stack. After getString returns, message no longer exists, meaning that the pointer returned by getString, which was set to point to message is no longer valid.