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

int find_string(const char *str1, const char *str2)
{
    int res = strstr(str1, str2) - str1;
    return res < 0 ? -1 : res;
}

int main() {
    const char p[] = ":Fallen!~Fallen@Xeonz.users.quakenet.org PRIVMSG #Fallen :Hello";
    char *msg;
    int pos = find_string(p, " :");
    printf("pos is: %d\n", pos);
    memcpy(msg, &p[pos], strlen(p)-pos); //this line
    printf("msg: %s\n", msg);
    return 0;
}