How do you initialize matrix value in c but in pointer?

void addTodo(char *todo)
{
    int j = 0;
    for (j; j < strlen(todo); j++)
    {
        matrix[CurrentTodoIndex1][j] = todo[j];// I wanna make it Pointer based no do this //how do I do it  
    }
    matrix[CurrentTodoIndex1][j] = '\0'; 
    CurrentTodoIndex1++;
}