#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>

char* strdup(const char* src) {
    // Measure the string and get the needed size, including the null terminator ('\0')
    int src_length_bytes = strlen(src) + 1;  // srclen(…) does not count the '\0'

    // Allocate memory on the HEAP.
    char* copy = malloc(src_length_bytes * sizeof(*copy));  // CORRECT
    //                  └──────────────┬───────────────┘
    //                  # of bytes to allocate

    // Copy the characters, one by one.
    for(int i = 0; i < src_length_bytes; i++) {
        copy[i] = src[i];
    }

    return copy;
}

int main(int argc, char* argv[]) {
    char* s1 = "Babar";
    char* s2 = strdup(s1);  // make a copy of s1 on the heap.
    printf("s1 == \"%s\"\n", s1);
    printf("s2 == \"%s\"\n", s2);

    free(s2);
    return EXIT_SUCCESS;
}
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