smal fixes

src/base64.c

@@ -61,7 +61,7 @@ static int b64inverse[] = {
 	43, 44, 45, 46, 47, 48, 49, 50, 51
 };
 
-u32 base64_decode(const u8* src, u32 src_size, u8* dst){
+u32 base64_decode(const char* src, u32 src_size, u8* dst){
     // incomplete src
     if(src_size % 4 != 0)
         return 0;

src/string/StringBuilder.c

@@ -6,7 +6,8 @@ void StringBuilder_destroy(StringBuilder* b){
 }
 
 str StringBuilder_getStr(StringBuilder* b){
-    List_push(&b->buffer, u8, '\0');
+    if(b->buffer.size == 0 || ((char*)b->buffer.data)[b->buffer.size - 1] != '\0')
+        List_push(&b->buffer, u8, '\0');
     str result = str_construct((char*)b->buffer.data, b->buffer.size - 1, true);
     return result;
 }