added loading files

final/dynstr.h

@@ -1,5 +1,6 @@
 #ifndef DYNSTR_H
 #define DYNSTR_H
+#include <stdio.h>
 
 typedef struct {
     int size;
@@ -13,6 +14,10 @@ String_t str_from_chars(char* string);
 
 String_t str_from_slice(char* string, int len);
 
+String_t str_from_file(FILE* file);
+
+int str_push_str(String_t* string, char* other);
+
 String_t str_new();
 
 String_t* str_lines(String_t* self, int* numlines);