How to remove a char from a C char array by index.

I use the following to remove a char from a C char array by index.

In this instance, I search for the first char and if it's a 0 then remove it.

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

int main()
{
    char    cert_name [10];
    sprintf(cert_name,"01423785");
    printf("%s length:%d\n",cert_name,(int)strlen(cert_name));
    if (cert_name[0] = '0')
    {
        printf("It seems the first char is a 0\n");
        int idxToDel = 0;
        memmove(&cert_name[idxToDel], &cert_name[idxToDel + 1], strlen(cert_name) - idxToDel);
    }
    printf("%s length:%d\n",cert_name,(int)strlen(cert_name));

    return 0;
}

memmove [source]