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#include <iostream>
#include <cstring>
#define T_SIZE 1001
 
char* string_merge(char *, char *);
 
int main()
{
    char text[T_SIZE];
    char text2[T_SIZE];
    int how_many_step = 0;
    std::cin >> how_many_step;
    for ( int i = 0 ; i < how_many_step ; ++i )
    {
        int size_tab = 0;
        std::cin >> text >> text2;
        char* text_final = string_merge( text , text2 );
        for ( int i = 0 ; i < std::strlen(text_final) ; ++i)
            std::cout << text_final[i];
        std::cout << std::endl;
        delete[] text_final;
    }
    return 0;
}
char* string_merge(char *text, char *text2)
{
    int size_tab_final = 0;
    int index = 0;
    if ( std::strlen(text) > std::strlen(text2) )
        size_tab_final = std::strlen(text2);
    else
        size_tab_final = std::strlen(text);
    size_tab_final *= 2 ;
    char* text_final2 = new char[size_tab_final];
    for ( int i = 0 ; i < size_tab_final ; ++i)
    {
        if ( i % 2 == 0 )
            text_final2[i] = text[index];
        else if ( i % 2 == 1 )
        {
            text_final2[i] = text2[index];
            ++index;
        }
    }
    return text_final2;
}
 

prog.cpp: In function 'char* string_merge(char*, char*)':
prog.cpp:35:26: error: 'd' was not declared in this scope
     for ( int i = 0 ; i <d
                          ^
prog.cpp:36:11: error: expected ';' before 'size_tab_final'
           size_tab_final ; ++i)
           ^
prog.cpp:36:26: error: expected ')' before ';' token
           size_tab_final ; ++i)
                          ^
prog.cpp:36:30: error: 'i' was not declared in this scope
           size_tab_final ; ++i)
                              ^

Standard output is empty