C :

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



int main()
{
	int n;
	scanf("%d", &n);
	int *flag = (int *)malloc(n*sizeof(int));
	int i;
	int j, k;
	int len_a, len_b, len_c;
	int site = 0; 
	char a[200];
	char b[200];
	char c[400];
	char *p;
	char *q;
	for(i = 0; i < n; i++)
	{
		site = 0;
		flag[i] = 1;
		scanf("%s", a);
		scanf("%s", b);
		scanf("%s", c);
		len_a = strlen(a);
		len_b = strlen(b);
		len_c = strlen(c);
		if(len_c != len_a + len_b)
		{
			flag[i] = 0;
			continue;
		}
		p = a;
		for(j = 0; j < len_a; j++, p++)
		{
			while(*p != *(c+site) && *(c+site) != '\0')
			{
				site++;
			}
			if(*(c+site) == '\0')
			{
				flag[i] = 0;
				break;
			}
		}
		p = b;
		site = 0;
		for(j = 0; j < len_b; j++, p++)
		{
			while(*p != *(c+site) && *(c+site) != '\0')
			{
				site++;
			}
			if(*(c+site) == '\0')
			{
				flag[i] = 0;
				break;
			}
		}
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
	}
	for(i = 0; i < n; i++)
	{
		if(flag[i])
		{
			printf("Case %d: yes\n", i+1);
		}
		else
		{
			printf("Case %d: no\n", i+1);
		}
	}
	
	
	
	
	return 0;
} 

C++ :

#include<iostream>
#include<string>
using namespace std;
int main()
{
	int n,i,j,k1,k2;
	char q1,q2;
	cin>>n;
	string word1[n],word2[n],word3[n];
	string put[n];
	for(i=0;i<n;i++)
	    cin>>word1[i]>>word2[i]>>word3[i];
	for(i=0;i<n;i++)
	{
		k1 = 0;
		k2 = 0;
		q1 = word1[i][0]; 
		for(j=0;word3[i][j]!='\0';j++)
		{
			if(word3[i][j]==q1)
			{
				k1++;
			    q1 = word1[i][k1];
			}	    
		}
		q2 = word2[i][0];
		for(j=0;word3[i][j]!='\0';j++)
		{
			if(word3[i][j]==q2)
			{
				k2++;
			    q2 = word2[i][k2];
			}	    
		}
		if(q1 == '\0'&&q1 == '\0')
		    put[i] = "yes";
		else 
		    put[i] = "no";
	}
	for(i=0;i<n;i++)
	    cout<<"Case "<<i+1<<": "<<put[i]<<endl;
}

Java :

import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
		int n=input.nextInt();
		String a=null;
		String b=null;
		String c=null;
		
		
			for(int i=0;i<n;i++) {
				a=input.next();
				b=input.next();
				c=input.next();
				
				if((a.length()+b.length())==c.length()) {
					int num=0,pos=0;
					for(int j=0;j<a.length();j++) {
						char target=a.charAt(j);
						for(;pos<c.length();pos++) {
							if(target==c.charAt(pos)) {
								num++;
								break;
							}
						}
		
				   }
					int num2=0,pos2=0;
					for(int j=0;j<b.length();j++) {
						char target=b.charAt(j);
						for(;pos2<c.length();pos2++) {
							if(target==c.charAt(pos2)) {
								num2++;
								break;
							}
						}

				   }
					if(num==a.length()&&num2==b.length()) {
						System.out.println("Case "+(i+1)+": yes");
					}else {
						System.out.println("Case "+(i+1)+": no");
					}
				}else {
					System.out.println("Case "+(i+1)+": no");
				}
				
			
				
			
		
		    }
			
			
			
	}
}