Name completion text splitter

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

int main(void)
{
    static char lbuf[1024];
    static char rbuf[1024];
    static char cbuf[1024];

    //const char *str = "testing between two spaces here --->    <--- ok";
    const char *str = "hello xyz world";
    size_t cursor_pos = 9;

    const size_t len = strlen(str);
    size_t split_pos = cursor_pos ? cursor_pos - 1 : 0;

    while (split_pos > 0 && !isspace(str[split_pos])) {
        --split_pos;
    }

    memcpy(lbuf, str, split_pos + 1);
    memcpy(rbuf, str + cursor_pos, len - cursor_pos);
    memcpy(cbuf, str + split_pos + 1, cursor_pos - split_pos);

    printf("%s\n", lbuf);
    printf("%s\n", rbuf);
    printf("%s\n", cbuf);
}