How to create a character array from a struct, and vice a versa

struct2chararray.c

#include <stdio.h>
#include <string.h>


typedef struct teststructure {
    int valid;
    char key[10];
    char value[10];
}test;

void print_struct_value(char* structarray);

int main(){

    test ts;
    ts.valid = 1;
    strncpy(ts.key,"hello\0",5);
    strncpy(ts.value,"bye\0",3);

    char* struct_array_converted = (char*) &ts;
    print_struct_value(struct_array_converted);

    return 0;
}

void print_struct_value(char* structarray){

    test *tsr;
    tsr = (test*) structarray;

    printf("The valid value is %d\n", tsr->valid);
    printf("The key is %s\n", tsr->key);
    printf("The value is %s\n", tsr->value);
}