Скопировать строки из одного текстового файла в другой, расположив их в нем в порядке уменьшения длины - C (СИ)

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
 
int main(){
    FILE *source, *result;
    char answer, symbol, *counter;
    char** buf;
    unsigned strcounter=0, i=0;
    int len[50];
    puts("Welcome to the program to sort the rows base using file.\nTranslation produced by http://translation.google.ru/");
    puts("Search for the file \"source.txt\"...");//Ïîèñê ГґГ*éëГ* source.txt
    source=fopen("source.txt","rt");
    if(source!=NULL){
        puts("File is found.");//Г”Г*éë Г*Г*éäåГ*
        puts("Delete the file (y\\n)?");//ÓäГ*ëèòü ГґГ*éë?
        do{
            answer=getch();
            switch(answer){
                case 'y':
                    fclose(source);
                    if(!remove("source.txt")) {
                        puts("File successfully deleted. The program is closed!");//Г”Г*éë ГіГ±ГЇГҐГёГ*Г® ГіГ¤Г*ëåГ*
                        getch();
                        return 0;
                    }
                    else {
                        puts("An error has occurred! The program is closed!");//ÏðîèçîøëГ* îøèáêГ*! ÏðîãðГ*ììГ* Г§Г*êðûâГ*ГҐГІГ±Гї!
                        return(-1);
                    }
                    break;
                case 'n': break;
                default: puts("Wrong answer"); answer=0; break; //ГЌГҐГЇГ°Г*âèëüГ*ûé îòâåò
            }
        }while(answer==0);
    }
    else{
        puts("File not found.");//Г”Г*éë Г*ГҐ Г*Г*éäåГ*
        puts("It creates the file...");//ÑîçäГ*ГҐГІГ±Гї ГґГ*éë...
        source=fopen("source.txt","wt");
        if(source!=NULL){
            puts("File successfully created!");//Г”Г*éë ГіГ±ГЇГҐГёГ*Г® ñîçäГ*Г*!
            fclose(source);
            puts("Write in the file \"source.txt\". The program is closed!");
            getch();
            return(0);
        }
        else{ puts("Error creating file!"); return(-2);}//ГЋГёГЁГЎГЄГ* ñîçäГ*Г*ГЁГї ГґГ*éëГ*!
    }
//-------Ïîäñ÷èòûâГ*ГҐГ¬ ñòðîêè Гў ГґГ*éëå--------------------------------------------
    while(!feof(source)){//Г–ГЁГЄГ« ïîâòîðÿåòñÿ äî òîãî, ïîêГ* Г*ГҐ äîéäåò äî ГЄГ®Г*Г¶Г* ГґГ*éëГ*
        symbol=fgetc(source);
        if(symbol=='\n' || symbol==EOF) strcounter++;
        else i++;
    }
    printf("%d|||%d",strcounter,i);
//  counter=(char *)malloc(i*sizeof(char));
    buf=(char **)malloc(strcounter*sizeof(char));//ÂûäåëåГ*ГЁГҐ ГЇГ*ìÿòè äëÿ äâóìåðГ*îãî äèГ*Г*ìè÷åñêîãî Г¬Г*Г±Г±ГЁГўГ*
    for(i=0;i<strcounter;i++){
        buf[i]=(char *)malloc(50*sizeof(char));
    }
    i=0;
    int j=0;
    while(!foef(source)){//Г‡Г*ГЇГЁГ±Гј ñòðîê Гў Г¬Г*Г±Г±ГЁГў
        buf[i][j]=fgetc(source);
        if(buf[i][j]=='/n') j++;
    }
    for(i=0;i<strcounter;i++){
        len[i]=strlen(buf[i]);
    }
    printf("%d",len);
    getch();
    free(counter); free(strcounter);
    return 0;
}

//-------Ïîäñ÷èòûâГ*ГҐГ¬ ñòðîêè Гў ГґГ*éëå--------------------------------------------
    while(!feof(source)){//Г–ГЁГЄГ« ïîâòîðÿåòñÿ äî òîãî, ïîêГ* Г*ГҐ äîéäåò äî ГЄГ®Г*Г¶Г* ГґГ*éëГ*
        symbol=fgetc(source);
        if(symbol=='\n' || symbol==EOF) strcounter++;
        else i++;
    }
    printf("%d|||%d",strcounter,i);
//  counter=(char *)malloc(i*sizeof(char));
    buf=(char **)malloc(strcounter*sizeof(char));//ÂûäåëåГ*ГЁГҐ ГЇГ*ìÿòè äëÿ äâóìåðГ*îãî äèГ*Г*ìè÷åñêîãî Г¬Г*Г±Г±ГЁГўГ*
    for(i=0;i<strcounter;i++){
        buf[i]=(char *)malloc(50*sizeof(char));
    }
    i=0;
    int j=0;
    while(!foef(source)){//Г‡Г*ГЇГЁГ±Гј ñòðîê Гў Г¬Г*Г±Г±ГЁГў
        buf[i][j]=fgetc(source);
        if(buf[i][j]=='/n') j++;
    }
    for(i=0;i<strcounter;i++){
        len[i]=strlen(buf[i]);
    }
    printf("%d",len);
    getch();
    free(counter); free(strcounter);
    return 0;