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#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>
 
string filter(string);
 
char sum(char, char);
 
int main(void) 
{   
    // Берем стринг 	
    string name = "32423423s asdasdasd 3dsads";
    // Фильтруем его 
    string filtered = filter(name);
    // выводим отфильтованное 
    printf("%s", filtered);
 
    char first[] = "123";
    char second[] = "324234";
    sum(first, second);
 
  return 0;
}
 
 
string filter(string c)
{
    string filtered_string = "";
 
    //counter step
    for (int i = 0, n = strlen(c); i < n; i++)
    {
        // в этом месте должно быть условие одупляющее буквы и пробелы 
        if ((i >= 'A' && i <= 'Z') || (i >= 'a' && i <= 'z'))
        {
            //printf("%c Y", toupper(c[i]));
            // А тут вместо равно долно обьеденять строку
        }
        else
        {
            //printf("%c N", toupper(c[i]));
        }
    }
 
    return filtered_string;
}
char sum(char a, char b)
{
    char aa[] = a;		
    char bb[] = b;
    strcat(aa, bb);
    return (char*) aa;
}

prog.c: In function ‘main’:
prog.c:21:9: warning: passing argument 1 of ‘sum’ makes integer from pointer without a cast [-Wint-conversion]
     sum(first, second);
         ^~~~~
prog.c:8:6: note: expected ‘char’ but argument is of type ‘char *’
 char sum(char, char);
      ^~~
prog.c:21:16: warning: passing argument 2 of ‘sum’ makes integer from pointer without a cast [-Wint-conversion]
     sum(first, second);
                ^~~~~~
prog.c:8:6: note: expected ‘char’ but argument is of type ‘char *’
 char sum(char, char);
      ^~~
prog.c: In function ‘sum’:
prog.c:50:17: error: invalid initializer
     char aa[] = a;
                 ^
prog.c:51:17: error: invalid initializer
     char bb[] = b;
                 ^
prog.c:53:12: warning: return makes integer from pointer without a cast [-Wint-conversion]
     return (char*) aa;
            ^~~~~~~~~~
prog.c:53:12: warning: function returns address of local variable [-Wreturn-local-addr]

Standard output is empty