read array number in line text

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

int main(void)
{
    /* khong doc duoc str khi bat dau bang dau tru (-)
    nen ta can them vao truoc no 1 ky tu nao do
    */
    char* str= "-1.223 %^& fsf 0.234 56.65 fsf 9 f";

    // khai bao, cap phat bo nho them s de cong them vao dau 1 ky tu
    char* const s = (char*)malloc(sizeof(strlen(str))+1);

    // cong them ky tu a
    strcpy(s, "a");
    strcpy(s + strlen(s), str);
    printf("%s\n",s);

    // tach lay cac so
    int total_n = 0;
    int n;
    float i; // cac so can tach

    printf("\nday cac so\n");
    while (1 == sscanf(s + total_n, "%*[^0123456789-]%f%n", &i, &n))
    {
        total_n += n;
        printf("%f\n", i);
    }

    return 0;
}