#include <stdio.h>
#include <cs50.h>

int main(void)
{
    printf("State our name: ");
    string s = GetString();
    printf("hello, %sn", s);
}

/tmp/ccHZXs2m.o: In function `main'
hell.c:(.text+0x16): undefined reference to `GetString'
collect2: error: ld returned 1 exit status
make: *** [hell] Error 1

int main(void) {
    string name;
    printf("Введите ваше имя");
    scanf("%s", name);
    printf("Привет, %sn!", name);
    return 0;
}

cc -c help.c -o help.o
cc -c cs50.c -o cs50.c
cc -o help help.o cs50.o

string GetString(void)
{
 return "test";
}

CC=clang
CFLAGS=-ggdb3 -O0 -std=c99 -Wall -Werror
LDLIBS=-lcs50 -lm

make hell

gcc -o ./hello[.exe] hello.c cs50/lib/src/cs50.c

get_string()