halfway done (need func connectable and actuallyconnect)

/* solver.c */

/* Last Change: 2018/07/09 (Mon) 15:54:41. */

#include<stdio.h>

/* #include<stdlib.h> */

#include<string.h>

/* #include<limits.h> */

/* #include<math.h> */

/* #include<time.h> */

int board[8][72][72];

int depth,height,width;

int lines;

//z,y,x

void reset(void){

	int i,j,k;

	for(i=0;i<depth;i++)

		for(j=0;j<height;j++)

			for(k=0;k<width;k++)

				board[i][j][k]=0;

	return;

}

void read(void){

	int x,y,z,i;

	char c,str[8];

	scanf(" %s",str); //SIZE

	scanf(" %d",&width);

	if(width>72||width<=0)

		printf("Error: width\n");

	scanf(" %c",&c); //X

	scanf(" %d",&height);

	if(height>72||height<=0)

		printf("Error: height\n");

	scanf(" %c",&c); //X

	scanf(" %d",&depth);

	if(depth>8||depth<=0)

		printf("Error: depth\n");

	scanf(" %s",str); //LINE_NUM

	scanf(" %d",&lines);

	if(lines<=0)

		printf("Error: lines\n");

	for(i=1;i<=lines;i++){

		scanf(" %s",str); //LINE#X

		scanf(" %c",&c); //(

		scanf(" %d",&x);

		if(x>=72||x<0)

			printf("Error: x\n");

		scanf(" %c",&c); //,

		scanf(" %d",&y);

		if(y>=72||y<0)

			printf("Error: y\n");

		scanf(" %c",&c); //,

		scanf(" %d",&z);

		if(z>=72||z<0)

			printf("Error: z\n");

		scanf(" %c",&c); //)

		board[z-1][y][x]=-i;

		scanf("%c",&c); //)

		/* scanf(" %[ -]",&c); //space or - */

		scanf(" %c",&c); //(

		scanf(" %d",&x);

		if(x>=72||x<0)

			printf("Error: x\n");

		scanf(" %c",&c); //,

		scanf(" %d",&y);

		if(y>=72||y<0)

			printf("Error: y\n");

		scanf(" %c",&c); //,

		scanf(" %d",&z);

		if(z>=72||z<0)

			printf("Error: z\n");

		scanf(" %c",&c); //)

		board[z-1][y][x]=-i;

	}

	return;

}

int order(int num){ //1-lines -> 1-lines

	return num;

}

int connected(int line){

	int i,j,k;

	for(i=0;i<depth;i++)

		for(j=0;j<height;j++)

			for(k=0;k<width;k++)

				if(board[i][j][k]==line)

					return 1;

	return 0;

}

int connectable(int linea,int lineb){

	//REQUIRED

	return 0;

}

void actuallyconnect(int num){

	//REQUIRED

	return;

}

void delete(int line){

	int i,j,k;

	for(i=0;i<depth;i++)

		for(j=0;j<height;j++)

			for(k=0;k<width;k++)

				if(board[i][j][k]==line)

					board[i][j][k]=0;

	return;

}

void connect(int num){

	int i;

	if(connectable(order(num),0))

		actuallyconnect(order(num));

	else

		for(i=num-1;i>=1;i--)

			if(connectable(order(num),order(i))){

				delete(order(i));

				actuallyconnect(order(num));

				connect(i);

			}

	return;

}

void solve(void){

	int i;

	for(i=1;i<=lines;i++)

		connect(i);

	return;

}

void write(void){

	int i,j,k;

	printf("SIZE %dX%dX%d\n",width,height,depth);

	for(k=0;k<depth;k++){

		printf("LAYER %d\n",k+1);

		for(j=0;j<height;j++){

			for(i=0;i<width-1;i++){

				if(board[k][j][i]<0)

					board[k][j][i]=-board[k][j][i];

				printf("%d,",board[k][j][i]);

			}

			if(board[k][j][i]<0)

				board[k][j][i]=-board[k][j][i];

			printf("%d",board[k][j][i]);

			printf("\n");

		}

	}

	return;

}

int main(void){

	reset();

	read();

	solve();

	write();

	return 0;

}