#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 20


char *get_string(char *str) // the function what allocate memory for the same string, and copy the string section in to the new string and print it.
{
	int length;
	char *new_str;

	if (!str) // return a null pointer (0) if there is no available memory or if the arena has been detectably corrupted by storing outside the bounds of a block
	{
		printf("Error!Not enough memory!\n");
		exit(1);
	}

	else
	{
		length = strlen(str);
		new_str = (char*)malloc(sizeof(char)*(length + 1)); // Initial memory allocation, memory allocated using malloc
		strcpy(new_str, str);
		return new_str; // The return value of the function.
	}
}
void main()
{

	char str[N], *new_str;
	printf("Please enter a string: ");
	scanf("%s", str);
	new_str = get_string(str);
	printf("The new string from the function is: %s\n", new_str);  // printing a value of the new function


	free(new_str); // done with the int objects, and free the associated pointer

}