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#ifndef FUNCTION07_H_
#define FUNCTION07_H_
 
#include <stdio.h>
#include <stdlib.h>
 
void sort_by_length (char* strings[], int size);
 
int main() {
    int size;
    scanf("%d", &size);
    char** strings;
    strings = (char**) malloc(sizeof(char*) * 100000);
    for (int i = 0; i < size; i ++) {
        strings[i] = (char*) malloc(sizeof(char) * 21);
        scanf("%s", strings[i]);
    }
    sort_by_length(strings, size);
    for (int i = 0; i < size; i ++) {
        printf("%s%c", strings[i], " \n"[i == size - 1]);
    }
    return 0;
}
#endif // FUNCTION7_H_
 

prog.c: In function ‘main’:
prog.c:11:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &size);
     ^~~~~~~~~~~~~~~~~~
prog.c:16:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", strings[i]);
         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /home/w9Ju60/cc30PTFC.o: in function `main':
prog.c:(.text.startup+0x7c): undefined reference to `sort_by_length'
collect2: error: ld returned 1 exit status

Standard output is empty