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

void str_cat(char s[], char k[]);
void copy_string(char sours[], char destination[]);

int main()
{
        char str[1000], sours[1000], destination[1000];

        printf("Input a strig in sours\n");
        fgets(sours, 999, stdin);

        int choice;
        printf("if you need copy input 1, if you need concatination input 2: ");
        scanf("%d", &choice);

        switch (choice){
        case 1:
                copy_string(sours,destination);
                printf("The copy string: %s\n", destination);
                break;
        case 2:
                printf("Input a strig in str\n");
                fgets(str, 999,stdin);

                str_cat(sours, str);
                printf("The string: %s\n", sours);
                break;
        default:
                printf("Error\n");
        }

        return 0;
}
void copy_string(char sours[], char destination[])
{
        int c = 0;

        while (sours[c] != '\0'){
                destination[c] = sours[c];
                c++;
        }

        destination[c] = '\0';

}
void str_cat(char sours[], char str[])
{
        int c = 0;
        int cc = 0;

        if (strlen(sours) + strlen(str) <= 1000){
                while(sours[c] != '\n'){
                c++;
                }

                int p;
                printf("do you need 'space'? 1 or 2: ");
                scanf("%d", &p);
 				switch(p){
                        case 1: sours[c] = ' ';
                                c++;
                        case 2:  while(str[cc] != '\0'){
                                sours[c] = str[cc];
                                c++;
                                cc++;
                                }
                                break;
                        default: printf("Error");
                }

                sours[c] = '\0';
        }
}