Revert "rmpiskvorky"

This reverts commit 4974652f.

piskvorky.c

+#include <stdio.h>
+#include <stdlib.h>
+#include "piskvorky.h"
+
+int main() {
+    printf("Enter the size of field: ");
+    int size;
+    scanf("%d", &size);
+
+    char field[size];
+    for (int i = 0; i < size; i++) {
+        field[i] = ' ';
+    }
+    draw(field, size);
+
+    char player = 'B';
+    while (!isSolved(field, size)) {
+        player = (player == 'A') ? 'B' : 'A';
+        printf("Player %c: ", player);
+
+        int position;
+        scanf("%d", &position);
+
+        int cross = addCross(field, size, position);
+
+        if ( cross == -1 ) {
+            printf("Wrong position!\n");
+            continue;
+        } else if ( cross == 0 ) {
+            printf("X is already there!\n");
+            continue;
+        }
+
+        draw(field, size);
+    }
+
+    printf("Player %c wins!\n", player);
+
+    return EXIT_SUCCESS;
+}
+
+void draw(char field[], int size) {
+    printf("\n");
+    for (int i = 0; i < size; i++) {
+        printf(" %d", i+1);
+    }
+    printf("\n");
+
+    printf("+");
+    for (int i = 0; i <size; i++) {
+        printf("-+");
+    }
+    printf("\n");
+
+    printf("|");
+    for (int i = 0; i < size; i++) {
+        printf("%c|", field[i]);
+    }
+    printf("\n");
+
+    printf("+");
+    for (int i = 0; i < size; i++) {
+        printf("-+");
+    }
+    printf("\n");
+}
+
+int addCross(char field[], int size, int position) {
+    if(position < 0 || position > size){
+        return -1;
+    }
+
+    if(field[position-1] == 'X'){
+        return 0;
+    }
+
+    field[position-1] = 'X';
+    return 1;
+}
+
+int isSolved(char field[], int size) {
+    for(int i = 0; i < size-2; i++){
+        if(field[i] == 'X' && field[i+1] == 'X' && field[i+2] == 'X'){
+            return 1;
+        }
+    }
+
+    return 0;
+}