A string replace implementation in C

string_replace_with.c

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

char *replace_with(char *dest, char const *old, char const *new)
{
    size_t tail_len = 0;
    size_t old_len = strlen(old);
    size_t new_len = strlen(new);
    char *match;

    while ((match = strstr(dest, old))) {
        tail_len = strlen(match + old_len);
        memmove(match + new_len, match + old_len, tail_len + 1);
        memcpy(match, new, new_len);
    }
    return dest;
}