=?windows-1255?q?error_when_create_dll_for_postgres?= =?windows-1255?q?=FE?=

hello, thanks for your help. 
i was being able to create the lib for the first function as below. the compiler work when the variable are int, if i declare any other variable like below, i start to recive erros. please see below the code and the recieved errors 

#include "postgres.h" 
#include <string.h> 
#include "fmgr.h" 

#ifdef PG_MODULE_MAGIC 
PG_MODULE_MAGIC; 
#endif 

/* by value */ 

PG_FUNCTION_INFO_V1(add_one); 
          
Datum 
add_one(PG_FUNCTION_ARGS) 
{ 
    int32   arg = PG_GETARG_INT32(0); 

    PG_RETURN_INT32(arg + 1); 
} 

/* by reference, fixed length */ 

PG_FUNCTION_INFO_V1(add_one_float8); 

Datum 
add_one_float8(PG_FUNCTION_ARGS) 
{ 
    /* The macros for FLOAT8 hide its pass-by-reference nature. */ 
    float8   arg = PG_GETARG_FLOAT8(0); 

    PG_RETURN_FLOAT8(arg + 1.0); 
} 

PG_FUNCTION_INFO_V1(makepoint); 

Datum 
makepoint(PG_FUNCTION_ARGS) 
{ 
    /* Here, the pass-by-reference nature of Point is not hidden. */ 
    Point     *pointx = PG_GETARG_POINT_P(0); 
    Point     *pointy = PG_GETARG_POINT_P(1); 
    Point     *new_point = (Point *) palloc(sizeof(Point)); 

    new_point->x = pointx->x; 
    new_point->y = pointy->y; 
        
    PG_RETURN_POINT_P(new_point); 
} 

/* by reference, variable length */ 

PG_FUNCTION_INFO_V1(copytext); 

Datum 
copytext(PG_FUNCTION_ARGS) 
{ 
    text     *t = PG_GETARG_TEXT_P(0); 
    /* 
     * VARSIZE is the total size of the struct in bytes. 
     */ 
    text     *new_t = (text *) palloc(VARSIZE(t)); 
    VARATT_SIZEP(new_t) = VARSIZE(t); 
    /* 
     * VARDATA is a pointer to the data region of the struct. 
     */ 
    memcpy((void *) VARDATA(new_t), /* destination */ 
           (void *) VARDATA(t),     /* source */ 
           VARSIZE(t)-VARHDRSZ);    /* how many bytes */ 
    PG_RETURN_TEXT_P(new_t); 
} 

PG_FUNCTION_INFO_V1(concat_text); 

Datum 
concat_text(PG_FUNCTION_ARGS) 
{ 
    text  *arg1 = PG_GETARG_TEXT_P(0); 
    text  *arg2 = PG_GETARG_TEXT_P(1); 
    int32 new_text_size = VARSIZE(arg1) + VARSIZE(arg2) - VARHDRSZ; 
    text *new_text = (text *) palloc(new_text_size); 

    VARATT_SIZEP(new_text) = new_text_size; 
    memcpy(VARDATA(new_text), VARDATA(arg1), VARSIZE(arg1)-VARHDRSZ); 
    memcpy(VARDATA(new_text) + (VARSIZE(arg1)-VARHDRSZ), 
           VARDATA(arg2), VARSIZE(arg2)-VARHDRSZ); 
    PG_RETURN_TEXT_P(new_text); 
} 


the error 

in function 'makepoint': 
error: 'Point' undeclared (first use in this function) 
error: (each undeclared identifier is reported only one 
error: for each function it appears in.) 
error: 'pointx' undeclared (first use in ֲ´this function) 
error: 'pointy' undeclared (first use in his fnction) 
error 'new_point' undeclared (first use in his function) 
error: syntax error befre ')' oken 
in function 'copy text': 
error: 'invalid lvalue in assinment 
In function 'concat_text' 
error: invalid lvalue in assignement 
warning no new line at end of file 

Please any direction of how to solve the problem 

thanks 

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