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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/string/byte/strdup.html below:

strdup - cppreference.com

char *strdup( const char *src );

Returns a pointer to a null-terminated byte string, which is a duplicate of the string pointed to by src. The space for the new string is obtained as if the malloc was invoked. The returned pointer must be passed to free to avoid a memory leak.

If an error occurs, a null pointer is returned and errno might be set.

A pointer to the newly allocated string, or a null pointer if an error occurred.

The function is identical to the POSIX strdup.

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
    const char *s1 = "Duplicate me!";
    char *s2 = strdup(s1);
    printf("s2 = \"%s\"\n", s2);
    free(s2);
}

Output:

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